The Gamma Collection is the weapon collection of the Gamma Case, added to the game in 2016. It holds 17 weapon skins, from Mil-Spec Grade to Covert. SkinsMonkey lists every Gamma Collection skin with prices for each wear level.
The Gamma Collection is the set of 17 weapon skins tied to the Gamma Case. Every skin in the set shows The Gamma Collection in its in-game details. The case also drops 5 knife models as rare special items: Bayonet, Flip Knife, Gut Knife, Karambit and M9 Bayonet. Knives are not part of any collection, so you will not find them in the list below.
A trade-up contract takes 10 skins of the same rarity and returns one skin of the next rarity up, picked from the collections of the skins you put in. Fill the contract only with Gamma Collection skins and the result is always a skin from this set. StatTrak and regular skins cannot be mixed in one contract. Since the CS2 update of 22 October 2025, five Covert skins can also be exchanged for a knife from the collection of one of the skins used. With five Covert skins from The Gamma Collection, the knife comes from the Gamma Case pool.
The Gamma Case page covers the container itself, and all CS2 collections are listed on one page.