Eye Bling Caps are the only charms that attach to any glass frames less than 1/2 inch thick via our patented method.  Each package comes with 2 metal mini bottle caps with the same image and three rubber attachment pieces. The extra attachment piece is to test the thickness! The rubber piece houses a secret magnet that the caps adhere to magnetically. Because they are removable you can "BLING UP" all your eyewear.