ProMag magazines are made from rugged high carbon heat-treated steel springs are made of durable heat-treated music wire and the followers and bases are high quality injection molded polymers. And best of all they're WARRANTED for Life! Fits CZ, CZ-75/TZ-75 Baby Eagle, .40 S&W, 11rd Restrictions are observed in the following cities and/or states prohibiting the sale or shipment of magazines with more than a 10rd capacity to: Aurora, Il; Chicago, Il; Cook County, Il; Cincinnati, OH; Columbus, OH; Toledo, OH; South Bend, IN; All of CA; All of CT; All of HI; All of MA; All of NJ; All of NY.