Feature:Adjustable quickly and easily make your own beautiful rings by bonding any flat component onto the pad; Perfect for larger components and cabochons, dichroic glass, crystals, beads, shells, buttons, vintage typewriter keys, altered art and anything else your mind comes up Note:they are very cheap,not in good quality,unsuitable for expensive jewelry,pls note that before u buy Size:approx. outer dia.20mm x 5mm wide,Blank:dia.14mm