CM Products Power Mags are lean and sleek yet extra-heavy-duty with increased reliability and service life. Unique all steel follower design yields the lowest possible bearing surface for longer lasting function in dirty environments, when ongoing cleaning and maintenance may not be possible. The unique follower design, which also functions as a spring, allows the Rocket wire spring coils to be the largest; side to side, front to back and top to bottom, of any extra capacity .45 cal 1911 mags. FeaturesExtra-heavy-dutyIncreased reliability and service lifeAll steel follower yields low bearing surface