This is a Walther factory OEM extended magazine for the Walther WMP pistol. The body is constructed from stainless steel and made to Walther's exact specifications and tolerances, using the same manufacturing and materials as found with your original firearm, ensuring perfect fit and operation. This magazine is designed to hold 10 rounds of .22 WMR (also known as .22 Magnum) ammunition and makes a great pairing with your Walther WMP pistol.