Ion Plating(IP) 304 Stainless Steel Beads, Grooved Beads, Column, Real 18K Gold PlatedSize: about 10mm in diameter, 5mm thick, hole: 6mm.Made of high quality stainless steel it is a great affordable alternative to sterling silver because it looks similar, is hypoallergenic, durable, does not rust, change color or tarnish, and will last a lifetime.