This is a 10 round 9mm gun magazine that fits ruger lc9/ec9s guns. This magazine is made in the usa by Promag Industries. Constructed from heat-treated blued-steel, with a follower, lock-plate, and base-plate molded from DuPont Zytel based black polymer. This magazine features ProMag ANTI-FATIGUE LOAD’UM up and STACK’UM up chrome silicon springs.