Thank you for viewing! The size is approximately 12cm. A brooch pin and a ring for attaching a strap are attached to the back. The strap is not included. This is handmade, so I try to be careful, but there may be some imperfections. Please understand this before purchasing. I can add more photos of the details if you would like. Thank you. We offer combined purchases. 2 for 1500 yen. 3 for 2000 yen.