Power Mags are lean and sleek, yet they are extra-heavy-duty with increased reliability and service life. A unique all-steel follower design yields the lowest possible bearing surface for long-lasting function in dirty environments when ongoing cleaning and maintenance may not be possible. The unique follower design also functions as a spring, which allows the high tensile rocket wire spring coils to be the largest (side to side, front to back, and top to bottom) of any .45 caliber 1911 magazine.Features :Laser Welded TubeSmooth Finish for Easy Insertion / RemovalHigh Tensile Rocket Wire Spring