They feature glass-filled polymer construction with a clear polymer allowing you to monitor your ammunition. Hardened steel inserts and heat-treated chrome silicon wire spring provide maximum reliability and smooth feeding. Special finger taps support quick and easy reloading. Technical Specifications Weight 1.5lbs Color Black/Clear Compatible with Glock 22 / 23 / 27 / 35 Caliber .40 Capacity 50 rounds Body Material Polycarbonate Spring Material Leaf spring   DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.