MATERIAL⟢ Stainless Steel, Resin MEASUREMENTS⟢ Necklace Circumference: 42 cm / 16.5 in, Extension: 5 cm / 2 in HANDMADE PIECE ⟢ As the necklaces contains UV resin. Avoid heat, direct sunlight, and prolonged moisture. Water resistant, not waterproof. Store in a cool, dry place