Features: SUPER silents HAMSTER WHEEL:silents Hamster wheel with Ball bearing, it bring your little hamster running happiness. mouse wheel also bring you a quiet night even. ADJUSTABLE HEIGHT brackets:more stable and firmer,small animal exercise wheel easy to access,you can adjust the height of the hamster wheel's running drum,gerbil wheel The solid base design bring your convenience. OMFORT silents HAMSTER WHEEL:exercise wheel Reasonable Size of Running Drum & Wide Running track bring a relax back feeling, as they do not need to bend their back when running, hamster car them enjoy their running time. CHEWING-RESISTANCE:mouse wheel achieves a reliable standing & support when running or walking.hamster wheel silents Smooth rotation. NECESSARY HAMSTER CAGE ACCESSORIES: wheel like a runner to help them to broken boredom & enriching their nighttimes, hamster wheel,also keep them to exercise. Specifications: Materials: PET Styles:01,02,03 Package Includes: 1Set silents Hamster Exercise wheel note: Please allow 1-2cm errors due to manual measurement. Due to the differences betweeen different monitors,the picture may not reflect the actual colour of the item.