Ion Plating(IP) 304 Stainless Steel Beads, Manual Polishing, Flat Round, GoldenSize: about 11mm diameter, 3.6mm thick, hole: 1.6mm.Double Sided Manual Polishing: These beads are hand-polished, which means that the front and back of the beads are manually put on the polishing wheel to friction, making it more shiny and smoother