ETS mags won't crack or break, are resistant to heat, cold, UV and harsh chemicals and won't become brittle over time. Their mags come with enhanced features like non-tilt followers, creep-resistant feed lips and clear body allowing you to see count and ammo type, leaving nothing to chance. Flush fit for full size Heckler & Koch VP9 9mm Extended 21-round capacity Base plates interchangeable with ETS line of 9mm double stack magazines Easy disassembly with their specially designed base plate Ergonomically designed floor plate makes it easy to grab from mag pouches