This Bersa magazine features a carbon steel tube with a steel follower, polymer finger rest, and removable butt-plate. This model is compatible with Bersa Thunder 380, has an 8-round capacity, and blued finish. NOTE: This model is not for use with Bersa conceal carry models.Feature: Increased capacity of 8-roundsCarbon steel tube, heat-treated for strengthHigher tensile music wire springSteel followerPolymer finger rest removable butt-plate