This is a 1.25 lb. (20 oz.) CO2 bottle with the simple pin valve. The Pin Valve model is used in the Sidearm Systems and the PTM-0124. This is not the bottle for the Jet Paks. The bottle is powder coated Team Yellow and high quality valve is leak-proof and maintenance free. These bottles are shipped empty and are filled at paintball supply shops or refill them yourself from a 10-35 lb. CO2 tank with our new refill tools. Our bottles include a billet aluminum, anodized valve protector. We recommend the valve protector be used at all times as one drop WILL ruin the valve.