Products Include The product includes two hamster running balls of different colors (pink and yellow), which are enough to meet the daily exercise needs of hamsters. The diameter is 12cm. Please measure the size of your pet before purchasing. This is definitely a favorite place for pets. It is safe and warm. Let them sleep or play in it. High Quality The transparent hamster ball is made of high-quality environment-friendly plastic, with ventilation holes, safe and breathable, durable, not easily damaged and worn, easy to clean and odor resistant. It can help pets alleviate boredom. Transparent and Unique Design The transparent design of the hamster ball allows you to see clearly when training hamsters. You can observe your pet's movement in the hamster ball at any time, and have more fun with your pet. Easy to Use The cover is designed with snap fastener, which is very easy to install. Just align the button of the cover with the corresponding position of the running ball, and then tighten the cover to use. The hamster running ball has a safety vent to ensure that your pet can play safely inside the ball Widely Used Running ball is very suitable for hamsters, mice, gerbils, guinea pigs, mice and other small animals. They can feel safe and warm inside the ball, and can also sleep or play in it.