The 45 lb weight plate necklace is sleekly unisex and made of solid sterling silver. A mini of our original 45lb weightlifting necklace. This version is 9mm (3/8") in diameter. It's half the size of the original 45 lb weight plate necklace. Our lifting jewelry is all handmade in NYC. Care instructions for Weight Plate: To keep the black portions intact, do not use dips or immerse in water. Just use polishing cloth to clean tarnish. Comes with 18" chain of your choice below or as a charm alone.