High-quality MaterialHamster ball is made of plastic material,non-toxic and tasteless,can use long service life.It's eco-friendly and no harm to the pet. .DIY Combination ToysThis small hamster ball can be connected to external pipes,and extent space for little pets,which allows you to DIY combinations to increase the activity area for pets.You can also match this ball with railway,so the ball can rolling on the railway. .Easy to InstallThe pet rodent mice jogging ball adopts the lock design,can be molded with a light press,which is easy to install.Please confirm the size of the pet before purchase and choose the appropriate running ball for your hamster. .HealthyThis hamster exercise wheel provides a healthy and safe way for small pet or hamster doing exercise,relieves boredom and increases activity level and giving your pet a fun spot to play. .Breathable and ComfortableThis hamster ball is more stable and good size for hamsters.Hollow design on both sides of the running wheel makes the running wheel more breathable.There are multiple vent holes on the ball,which is safe and breathable,and your small pets can play in it for a long time .