1. [DIY Combination Toys]: This small hamster ball can be extended infinitely with external pipes, making your DIY combination to increase the difficulty of pet activities!2.Environmental protection material: The hamster sports ball is made of high-quality environmentally friendly plastic material to protect the health of pets. Made of new PC material, with lock design, easy to install, convenient and fast!3. [Hollow-out runner]: The hollow design on both sides of the impeller makes the impeller more breathable and allows the hamster to do aerobic exercise. There are multiple ventilation holes on the ball to make the ball safe and breathable, so your little pet can play for a long time!4.Transparent ball: Pets can play in the transparent big hamster ball, and the owner can see the pet's every move. So wonderful!5.Easy installation: The ball is designed with a lock, and it can be formed by pressing lightly. Installation is easy!