The most powerful and reliable 8rd .45 cal 1911 mags Power Mags are lean and sleek yet extra heavyduty with increased reliability and service life. The 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. Its 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 .45cal 1911 mags.