Durable high density polymer build Base plate adds weight and also makes it easy to draw out of pouches for tactical reloads Designed to fit onto PMAG style magazines that come with a removable floor plate In the Box 1X Magazine Base Plate Specifications: Brand Double BellMaterial High Density PolymerCompatibility PMAG Style MagazinesWeight 2.5 oz California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov