Thank you for viewing! Made with 22mm walnut buttons. The back is felt-backed. The rubber band can be replaced. I make each item with care, but please understand that these are handmade items and consider this before purchasing. Handmade item bundle discount: 2 items purchased: 100 yen off 3 items purchased: 150 yen off 4 items purchased: 200 yen off 5 items purchased: 250 yen off Discounts cannot be applied after purchase, so please be aware of this.