Thank you for viewing! (*^-^*) The hook will be chosen at random. Please contact me if you would like the Usa-Dan M size. ○ Can be fixed in your favorite place with the hook. ○ Rabbits can enjoy digging, which helps with lack of exercise and stress relief. ○ You don't have to worry about the Usa-Dan slipping, so they can spend time safely. ⚪ Why not try it for a rabbit who is scared and won't get on the heater? ○ Can be washed. 〈Size〉 Approximately 40cm x 28cm 〈Material〉 Polyester ※ Heater is not included! ※ I hope you will like it.