This auction is for a NOS vintage mini bike or bicycle sprocket. it has 54 teeth and is about 8 3/4 inches diameter. It is about 3/16" thick. Look at pictures closely to see more detailed measurements.It does show some shelf wear but is new. Buyer pays shipping.If you would like to purchase shipping insurance let me know at the end of auction. Item must be paid for within 3 days or it will be relisted. Thanks. Save on shipping check out my other auctions. Will ship to USA only. Any questions please ask . Thanks Jim