The pet heater is for photography purposes only (not included). Made to fit the MARUKAN Hot Usa-Dan Reversible Heater M (RH-207) (for rabbits). Also compatible with Hedgehog Heater M, as they are the same size. Made with 100% natural cotton fabric... you can feel the gentle warmth. Some customers use it as a mat during the summer when not using it as a heater cover. We receive repeat orders from customers who purchase it every year <m(__)m> If you need more elasticity, you can put a small hand towel inside. It's sewn securely so it can withstand repeated washing. Size: Approximately 18.5cm x 24cm Material: Outer - Cotton To ensure safety even if chewed, it's secured with soft Velcro, the same type used in children's clothing. It's fastened on the back, so the rabbit shouldn't be able to pull it open. Heater inside: Product size... W230 x 160 x H14.5mm ★I made this because rabbits tend to slip on the pet heater. My rabbits are comfortable (I think)★ A small discount is available for purchasing two items, and a discount of about 100 yen per item is available for purchasing three or more. ★★The heater specifications state "Be careful, as wrapping the entire heater in a towel or futon can cause temperatures higher than the setting, leading to malfunction or fire." Some people have pointed out that wrapping the entire heater... This product has some extra space, and there is an opening at the top. The heater itself also has a moderate temperature, and I haven't had any concerns after using it for about two years, but if you are concerned, please refrain from purchasing. Although the materials are different, there are manufacturers that sell similar bag-shaped covers★ Handmade Rabbit Guinea pig Pet heater cover MARUKAN Hot Usa-Dan Small animals Hedgehog Shipping method may be changed (e.g., standard mail to Yuu Yuu Mercari delivery)