Size Measures: 8.7 inches external diameter, internal diameter 5.5 inches,The bottom color of Mat are send randomly Made of warm and soft fleece, it’s light weight and comfortable A ideal place for your little lovely pets,this mat is not only perfect for your pets crate but in the back of a car or am quite corner of your home Machine washable for easy clean Suitable for small pet eg. Sugar glider, Squirrel, Hamster, Mouse, Guinea pigs and other small pets