Rectangle shaped 6.7x25mm bead forms (also known as frames or perfect ring) made out of zamak (nickel-free non-tarnish zinc alloy), with a rhodium (silver) plating. These shaped frames/rings help you to make incredible jewelry elements, pendants, earrings, & more. This design makes a 4-sided curved rectangular polygon shape element for beadweaving, stitching, links, earrings, pendants, & more. Pack of 4. The frame is .9mm thick, allowing for 4.9mm space on the inside of the rectangle.