Pak consists of 10 general purpose rectangular pistol magazine springs. Five spring designs, 2 springs of each design included in the pak. Springs are designed to provide sufficient power output to replace defective and weakened magazine springs in .22, .25, .32/.380, 9mm and .38/.45 caliber single column standard magazines, restoring optimum feeding functions. All springs are made with extra coils to permit fitting to an infinite variety of semi-auto pistol magazines. Springs are essentially designed to be fitted to magazines having "L'" shaped followers.