This replacement magazine is a factory original from Kimber. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Featuring an aluminum type II anodized base, rocket wire spring, polymer follower and durable coating. The base is removable to allow internal cleaning and parts replacement. This magazine was developed to support the next generation of Kimber firearm. Keeping a few extra factory magazines around is never a bad idea; extra magazines save loading time at the range and also serve as a backup for those days when you simply cannot remember where you put your primary magazine.