Description: Material: Plastic Size: 10cm / 3.90" Colors: Red, Yellow, Blue, Transparent Feature: 1. Made of transparent acrylic, clear and see-through, allowing you to see your pet's every move. 2. Lightweight and portable, easy to carry and clean, allowing your pet to run freely anytime, anywhere. 3. Safe design to prevent pets from escaping and getting injured, giving you peace of mind to let your pet express its natural instincts. 4. Multi-functional, suitable not only for hamsters but also for other small pets, providing versatility with one purchase. 5. Provides opportunities for exercise and activity, promoting a healthy and happy life for your pet. Note: 1. Manual measurement may have an error of 1-2cm. Please understand, thank you. 2. Due to the difference between different monitors, the image may not reflect the actual color of the item. Package includes: 1* Acrylic hamster exercise ball