1911 DS Warrior 10MM Magazine- 18 Round – Checkmate magazines are made from the highest quality American milled stainless steel. Every tube is through-hardened for exceptional strength and durability. Tubes are polished inside and out to eliminate drag. The follower is designed featuring Check-Mates anti-friction self-lubricating polymer for exceptional feed and function with every round. Check-Mates high-performance springs offer high quality outstanding reliability and exceptional spring endurance.