Thank you for viewing! (o^_^o) The color of the hook may vary. 〇 This is a nap mat for pets. 〇 For rabbits, they can enjoy digging, which helps relieve stress. 〇 It can be easily attached to cages, etc., with a carabiner hook. 〇 The back is non-slip, preventing it from shifting. 〇 Size: 40cm x 40cm 〇 Material: Polyester, urethane foam 〇 It's a thick mat. 〇 It can be washed. ※ If you like it, please consider purchasing it. (*´ω｀*) Type of pet supplies... Heating/Cooling Supplies