This is a RWS/Umarex Magazine known as the SYNERGIS chambered in 177PEL, model 2251325.
Convenient two-pack of magazines for Umarex's Synergis underlever repeating air rifle. These magazines are chambered in .177 and hold 12 pellets. Load up all your magazine ahead of time and concentrate on shooting" not loading pellets.
Features:
Designed for Synergis Rifle
Capacity: 12 .177 Pellets