Tibetan silver is a widely used trade name in the jewellery-making industry for zinc alloy，it is a popular material used throughout jewellery supplies as it has great strength and resistance to corrosion, making it perfect for long lasting wear. Specification: Color: golden. Materials：Made of high quality alloy. Size: 4mm / ~ 0.16 inch, Hole size ~ 2mm /~ 0.08 inch, thickness ~ 1mm. Package Includes: 200 Pieces Spacer Beads