This magazine is made of metal and fully compatible with aftermarket airsoft guns using the similar design. The capacity of this magazine is 23rds. It takes 1 x 12g Co2 Canister and the valve + O-Ring are reinforced to accept extreme strong pressure of Co2 gas. The end cap of the magazine has patented design of better gastification of Co2 

Selling points:

1. High Quality O-Ring for Co2 sealing is used
2. Fully Compatible with Aftermarket Airsoft Pistol using the similar system
3. Patented design of the End Cap of better gastification of Co2