Increases reliability in all 1911 pistols; Aircraft grade certified stainless steel tube resists corrosion; .025" tube walls - thickest in the industry; Tubes are heat treated for maximum durability and service life; Fiber-fill nylon self-lubricating follower provides smooth round feeding; Maximum tensile strength heavy-duty spring for long service life, enhanced feeding and positive slide stop operation; Removable lo-profile steel base pad for easy maintenance and versatility with different base pad options; 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