ETS mags wont crack or break, are resistant to heat, cold, UV and harsh chemicals and wont 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.Features :Fits the .45 Glock 21, 30, 41 (does not fit SF)Extended 18-round capacityEasy disassembly with their specially designed base plateErgonomically designed floor plate makes it easy to grab from mag pouchesLifetime Warranty