This is a STAINLESS STEEL 7-round magazine that holds .450 bushmaster caliber ammunition, developed by C Product Defense.

Black-T is a multi-step process that employs a series of chemically bonding production steps that will provide optimal protection against rust, corrosion and external damage.  It can be used in a variety of applications across a broad number of metal substrates, including steel, stainless, aluminum, magnesium, titanium, brass, etc. CPD knows that using this process will practically assure that on the field or in the range these magazines will hold up against anything you throw at it.

The enternal side of this magazine consist of a black follower, and a stainless steel compression spring.

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.