Thank you for viewing! These were made with 27mm and 22mm walnut buttons. The back is felt. The rubber band can be replaced. I make them carefully, but please understand that these are handmade items and consider purchasing them. 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 Please note that discounts cannot be applied after purchase.