Psalm 144:1 DesignMy Rock and My Fortress - "Blessed be the Lord, my rock, who trains my hands for war, and my fingers for battle."Fixxxer slide back plates are made of T6 aluminum, hard coat anodized. Great replacement for a plastic factory part. All designs are laser engraved. Black anodized and permanent laser engraved slide cover plates are made from durable aluminum. Slide cover plates fit all Glock models and are easily installed.You will love the quality of FIXXXER products.Fits all Generation Glocks 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 30, 31, 32, 34, 35, 37, 38, 39Fixxxer LLC is proud to be an American Company. We stand behind our products, period.