The Gauntlet Air Rifle Rotary Mag advances each pellet with the operation of the bolt on the Umarex Gauntlet PCP air rifle. This mag is for .22 caliber pellets and holds 10 airgun pellets. The mag slides into the receiver with ease. Loads easily. And has numbers on it to indicate the shot you are on so that you're fully aware how many rounds you have left before the mag is empty. Package includes one mag.