Pet Hamster Guinea Pig Exercise Running Ball Play Gyro Toy Plastic Funny CP10 Feature Completely transparent running balls: It will not affect the pet's running vision in the inside, the owner can also see the internal real-time dynamics, the best interactive toys. Porous design: Increase the ball friction and air circulation, pets will not heat or feel difficult to breathe staying inside for a long time. Easy to operate: The blue cover is the entrance for the pet, and a small hole is reserved in the middle. You can provide a bracket to fix the running ball on it and make it into a fixed running wheel. A very suitable toy for hamsters and golden bears: It can give your pet more exercise, or it can be temporarily placed in a running ball when cleaning the pet's room. Safety and environmental protection material: adopt environmental protection plastic material, safe, non-toxic, no smell, please feel free to use. It's 10/12 centimeters in size (about 3.93/4.72 inches). Specifications: Pet Type: Hamster Material: Plastic Color: BluePink Diameter: 10/12 cm Package Included: 1X Running Ball