Increases reliability in all 1911 pistols; Aircraft Grade Certified Stainless Steel Tube resists corrosion; .025" Tube Walls - thickest in the industry and heat treated for maximum durability and service life; Fiber-Fill Nylon Self-Lubricating Follower provides feeding and positive lock back; Maximum Tensile Strength Heavy-Duty Stainless Steel Spring for long service life, enhanced feeding and positive slide stop operation without fear of corrosion; Removable Polymer Base adds grip length for enhanced shooting and rapid reloading and is marked for magazine numbering; No other magazine on the market can compare for proven inherent reliability, durability and the ability to remain loaded for long periods of time without damage; No-Risk Service Policy; Black Fluoropolymer Finish