Small case with a lost-dog tag function for carrying dog registration tags (for all dog breeds). Can also hold a 500-yen coin. Attach it by passing the collar or harness buckle (fastener) through the rubber on the back of the main body. ◎Cannot be attached to chain collars or choke collars that do not have a buckle that goes over the head. - Color: Blue - Material: Polyurethane (body), copper (hook, rubber) - Size: Approximately 4.5cm (width) x approximately 4.3cm (height) x approximately 1cm (depth/including rubber) - Weight: Approximately 10 grams Never used, and has been stored in a drawer. Thank you for looking.