Environmentally Friendly Material: The hamster ball is made of upgraded plastic material, so it can be durable and not easy to break. Relieves boredom and increases activity level and gives him a fun place to play. ;Transparent Sphere: This transparent design allows you to see clearly while the hamster is playing sports, and you can play with your pet for more fun. ;Comfortable Size: The diameter of the hamster running ball is 12cm, the perfect size is ideal for dwarf hamsters, providing a place for hamsters to exercise healthily. ;Installation Method : The shell adopts concealed buckle design. When installing, adjust the position of the cover buckle to the corresponding position of the running ball. At the same time, the lid must be twisted until the end is screwed. ;Note: If the animal does not know how to run for the first time, do not worry. You can leave your little pet in the running ball for a while, but don't force it. Once the animal has become familiar with running, it will gradually learn to avoid obstacles while running on flat ground.i;