.925 Sterling Silver One size fits most, inner diameter is approximately 2.5" Seven bezels range from 8mm to 15mm in diameter Handmade with Love & Sandy Hands in the USA® Dune Jewelry x 4ocean Main photo shown is handmade with 4ocean certified Plastic recovered from Hawaii & ethically sourced Hawaii Shells. Sand if from the Jersey Shore. This design will pull 10lbs of Plastic from our Ocean .925 Sterling Silver One size fits most, inner diameter is approximately 2.5" Seven bezels range from 8mm to 15mm in diameter Handmade with Love & Sandy Hands in the USA® Dune Jewelry x 4ocean Main photo shown is handmade with 4ocean certified Plastic recovered from Hawaii & ethically sourced Hawaii Shells This design will pull 10lbs of Plastic from our Oceans