Description: Size:4.7inch,Enough space for hamster's running. Eco-friendly and Safe Material: Made of environmental protection Resin, transparent, durable and non-toxic. Easy to clean, the whole ball can be washed with water. Encourage healthy exercise in a secure and safe way Makes a great temporary holding area to keep your furry friend while you clean their home Without sufficient exercise, baby hamsters will bite the cage due to excessive stress. Therefore, a careful owner should give the hamster a running ball to relieve pressure. At the same time, because the owners give hamsters very good nutrition, they often make hamsters obese, and it is easy for hamsters to change into diseases. A good running ball can give hamsters a healthy body. Specification: Product size: 12cm (diameter) Product weight: 53g Package: 1 x Hamster running ball Notes: Without sufficient exercise, baby hamsters will bite the cage due to excessive stress. Therefore, a careful owner should give the hamster a running ball to relieve pressure. At the same time, because the owners give hamsters very good nutrition, they often make hamsters obese, and it is easy for hamsters to change into diseases. A good running ball can give hamsters a healthy body.