$138.89Spectrum Case
$3.12 case + $15.56 key = $18.68
−86% returnOpen free
Gamma Case contents & odds
Every skin the Gamma Case can drop, the odds of each, what it costs to open and what it is worth on average. It first sold on the Steam Community Market on 10 June 2016.
Case price
$2.66
Key
$15.30
Cost to open
$17.96
Expected value
$2.77
Return
−85%
Prices updated 10 November 2026. Key: $15.30 (market, 43 listings). Case price is the lowest listing (403 listings).
About the Gamma Case
The Gamma Case holds 17 weapon skins across four rarities, plus a rare special pool of 30 knives. The most valuable regular skin is the M4A1-S | Mecha Industries, listed from $95.11 to $152.97 depending on wear. It costs $17.96 to open: $2.66 for the case and $15.30 for the key.
Because the rarity odds are fixed, the Gamma Case comes down to its list of skins. A knife or gloves drop is 0.26% per opening, about 1 in 385; open it 100 times and the chance of at least one is 23%. Want to see how that feels before paying? Try the Gamma Case in the free case simulator, which uses these exact odds, then compare it with every other case on the case odds page.
Gamma Case odds by rarity
Valve's disclosed rates are the same for every weapon case. What differs per case is how many skins share each tier, which sets the chance of each individual skin, and what those skins are worth.
| Rarity | Chance | Skins | Chance per skin | Average skin value | Adds to EV |
|---|---|---|---|---|---|
| Mil-Spec | 79.92% | 7 | 11.417% | $0.54 | $0.43 |
| Restricted | 15.98% | 5 | 3.196% | $2.15 | $0.34 |
| Classified | 3.20% | 3 | 1.067% | $13.38 | $0.43 |
| Covert | 0.64% | 2 | 0.320% | $103.25 | $0.66 |
| Rare special item | 0.26% | 30 | 0.009% | $349.18 | $0.91 |
| Total | 100.00% | $2.77 |
Expected value = sum of each rarity's chance times the average value of its skins. Skin value is the lowest listing at each wear, weighted by how much of the skin's float range falls in that wear, with the 10% StatTrak roll included. Wears with no live listing are left out of the average.
Gamma Case contents
Every skin below can drop. Odds are per opening; a price range is the lowest listing across the wears the skin can come in. Check the exact float range of any skin with the float checker.
Mil-Spec
79.92% for the tier, 11.417% per skin
P250
Iron Clad
$0.34 to $7.81
11.417% per opening · StatTrak
PP-Bizon
Harvester
$0.26 to $3.96
11.417% per opening · StatTrak
Five-SeveN
Violent Daimyo
$0.34 to $1.99
11.417% per opening · StatTrak
MAC-10
Carnivore
$0.32 to $1.95
11.417% per opening · StatTrak
Tec-9
Ice Cap
$0.40 to $0.93
11.417% per opening · StatTrak
SG 553
Aerial
$0.35 to $0.69
11.417% per opening · StatTrak
Nova
Exo
$0.29 to $0.46
11.417% per opening · StatTrak
Restricted
15.98% for the tier, 3.196% per skin
AUG
Aristocrat
$1.15 to $10.50
3.196% per opening · StatTrak
AWP
Phobos
$1.95 to $6.32
3.196% per opening · StatTrak
R8 Revolver
Reboot
$1.15 to $5.64
3.196% per opening · StatTrak
Sawed-Off
Limelight
$1.11 to $4.80
3.196% per opening · StatTrak
P90
Chopper
$1.21 to $3.42
3.196% per opening · StatTrak
Classified
3.20% for the tier, 1.067% per skin
M4A4
Desolate Space
$10.95 to $48.17
1.067% per opening · StatTrak
P2000
Imperial Dragon
$10.10 to $19.80
1.067% per opening · StatTrak
SCAR-20
Bloodsport
$10.28 to $11.60
1.067% per opening · StatTrak
Covert
0.64% for the tier, 0.320% per skin
M4A1-S
Mecha Industries
$95.11 to $152.97
0.320% per opening · StatTrak
Glock-18
Wasteland Rebel
$92.48 to $126.49
0.320% per opening · StatTrak
Rare special item
0.26% for the tier, 0.009% per item
★ M9 Bayonet
Gamma Doppler
$1,628.48
0.009% per opening · StatTrak
★ Karambit
Autotronic
$605.05 to $1,466.17
0.009% per opening · StatTrak
★ M9 Bayonet
Autotronic
$482.20 to $1,123.98
0.009% per opening · StatTrak
★ Karambit
Lore
$474.84 to $1,077.21
0.009% per opening · StatTrak
★ M9 Bayonet
Black Laminate
$374.10 to $1,053.33
0.009% per opening · StatTrak
★ Bayonet
Gamma Doppler
$587.10 to $891.57
0.009% per opening · StatTrak
★ Karambit
Black Laminate
$517.91 to $866.24
0.009% per opening · StatTrak
★ Karambit
Freehand
$454.84 to $724.74
0.009% per opening · StatTrak
★ M9 Bayonet
Lore
$327.28 to $695.00
0.009% per opening · StatTrak
★ Flip Knife
Gamma Doppler
$447.69 to $594.98
0.009% per opening · StatTrak
★ Karambit
Bright Water
$401.64 to $559.99
0.009% per opening · StatTrak
★ Bayonet
Autotronic
$219.87 to $508.79
0.009% per opening · StatTrak
★ M9 Bayonet
Bright Water
$275.66 to $469.93
0.009% per opening · StatTrak
★ M9 Bayonet
Freehand
$321.26 to $411.19
0.009% per opening · StatTrak
★ Bayonet
Lore
$194.03 to $406.68
0.009% per opening · StatTrak
★ Bayonet
Black Laminate
$133.88 to $283.07
0.009% per opening · StatTrak
★ Gut Knife
Gamma Doppler
$179.00 to $282.50
0.009% per opening · StatTrak
★ Flip Knife
Autotronic
$142.16 to $277.39
0.009% per opening · StatTrak
★ Flip Knife
Lore
$134.00 to $262.45
0.009% per opening · StatTrak
★ Flip Knife
Freehand
$107.53 to $218.36
0.009% per opening · StatTrak
★ Flip Knife
Black Laminate
$107.97 to $212.00
0.009% per opening · StatTrak
★ Gut Knife
Lore
$66.64 to $203.49
0.009% per opening · StatTrak
★ Bayonet
Freehand
$151.64 to $199.89
0.009% per opening · StatTrak
★ Bayonet
Bright Water
$127.28 to $175.57
0.009% per opening · StatTrak
★ Gut Knife
Autotronic
$75.26 to $168.96
0.009% per opening · StatTrak
★ Gut Knife
Black Laminate
$46.90 to $118.80
0.009% per opening · StatTrak
★ Flip Knife
Bright Water
$108.07 to $116.56
0.009% per opening · StatTrak
★ Gut Knife
Freehand
$50.85 to $114.99
0.009% per opening · StatTrak
★ Gut Knife
Bright Water
$50.30 to $67.99
0.009% per opening · StatTrak
★ Karambit
Gamma Doppler
No listing
0.009% per opening · StatTrak
Knives and gloves are the rare special pool: the case never shows which one until it opens, and the pool's average uses the average lowest listing across every item in it. See current knife prices on the cheapest knives page. “No listing” means nothing is on sale right now.
Other cases
$138.89
$352.52Glove Case
$7.59 case + $22.33 key = $29.92
−79% returnOpen free
$171.65Gamma 2 Case
$2.67 case + $18.42 key = $21.09
−87% returnOpen free
$488.49Chroma 3 Case
$2.82 case + $21.01 key = $23.83
−88% returnOpen free
$298.28Operation Wildfire Case
$2.30 case + $16.99 key = $19.29
−85% returnOpen free
$135.76Revolver Case
$2.23 case + $20.63 key = $22.86
−88% returnOpen free
See all CS2 cases, or work out what a drop would leave you after Steam's cut with the Steam fee calculator.
FAQ
How much does it cost to open a Gamma Case?
$17.96 at the prices of 10 November 2026: $2.66 for the case plus $15.30 for the key. This case uses its own key, which Valve no longer sells in its store, so the key price is the lowest player listing (43 listings).
What are the odds in the Gamma Case?
Valve's disclosed rates apply: Mil-Spec 79.92%, Restricted 15.98%, Classified 3.20%, Covert 0.64% and a rare special item (knives) 0.26%. With 7 Mil-Spec skins, each one is about 11.42%.
What is the best skin in the Gamma Case?
Among the regular skins, M4A1-S | Mecha Industries is the most valuable, listed from $95.11 to $152.97 depending on wear. The rare special pool (knives) holds the biggest prices, up to $1,628.48, at a combined 0.26% chance.
Is the Gamma Case worth opening?
On average, no: one opening is worth about $2.77 in lowest-listing prices against a cost of $17.96, a return of −85%. Selling on Steam takes a 15% fee on top, and the average is carried by very rare drops, so most single openings return less than they cost.
Can I open the Gamma Case for free?
Yes, in the case simulator. It uses this case's real contents, Valve's disclosed rates and the prices on this page, and it spins a reel for each opening. Nothing is bought and nothing is added to a Steam inventory. You can open up to five at once and the session tally shows what the cases and keys would have cost.
Do StatTrak skins drop from this case?
Yes. Any skin that exists as StatTrak has a 10% chance of being StatTrak when it drops. The expected value figures include that.
More CS2 tools
Case SimulatorOpen any CS2 case free with real odds, wear, float and prices.Case Odds & EVOdds per rarity and expected value of every case.Trade-Up CalculatorOdds, output floats, expected value and ROI for any ten-skin contract.Inventory Value CheckerPaste a Steam profile and price every CS2 item in it.Float CheckerDecode an inspect link, or look up any skin's float cap and wear tiers.Steam Market Fee CalculatorWhat a buyer pays and what you keep after Steam's 15% cut.
