50 ButtonsUCover Cover Buttons with Flat Backs Size 75 and Assembly Tool Kit 50 covers and 50 flat backs and assembly tool Covers and backs packed separately for convenience Perfect for updating decorative pillows and various crafts For sewing projects, use ButtonsUCover WIRE LOOP back buttons - flat back buttons require some type of adhesive to affix to projects No machinery required - can be hand assembled using included assembly tool