Our stainless steel tubes 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 with an extended front skirt featuring Check-Mates anti-friction self lubricating finish and proper dimple placement for exceptional feed and function with every round. Check-Mates proprietary high performance springs offer high quality, outstanding reliability and exception spring endurance.