This is a CZ® P-10 21-round extended magazine in 9mm.
Combining enhanced capacity with durable aluminum construction, steel spring internals, and clear-cut witness holes, these factory magazines are the perfect upgrade for your favorite CZ P-10 pistol. With rugged but lightweight glass-reinforced polymer construction, ergonomics designed to match the classic CZ75, and a striker-fired trigger that performs as well (if not better than) a Glock®, the CZ P-10 is a whole new generation of combat handgun that’s taking America by storm. Each CZ magazine is engineered to meet the same strict quality standards as your original equipment mags, delivering superior performance in practically any situation.