This is a factory 9mm 13-round magazine for Sig Sauer P228/P229 pistols.
Sig Sauer P228/P229 pistols represent decades of evolution and innovation for one of the world’s most successful series of combat pistols—now in compact size.
Standard Sig P229 magazines feature a 13-round capacity, stainless steel construction, polymer baseplate, and rugged internals designed for reliable feeding even in the most extreme environments. Built to the same exacting standards as the factory mags that came with your gun, Sig factory mags ensure peak performance from P229 pistols.
Don’t forget to rotate your loaded/carry magazines every 3-6 months in order to maximize their effective lifespan.