The right size 28 cm in diameter , which is the right size for small animals such as hamsters, mice and gerbils. The classic design of the reel has been reinforced with radial stripes to increase friction and prevent the hamster from slipping and falling. Exercise wheels encourage healthy exercise for small animals. Finished product size: length 28 cm, width 16.1 cm, height 30 cm, inner circle diameter 25.5 cm, runway width 13 cm. 100% NATURAL MATERIALS Made of eco-friendly board material, it is a kind of wood as raw material for the production of PVC health boards, waterproof, anti-moth, anti-aging, high hardness, not easy to crack, no paint and other characteristics. Metal bearing and independent bracket Our hamster exercise wheel with fixed bracket is strong enough to last a long time. It works very stably and prevents pets from being thrown out due to inertia while running. Fat mice can also use it. Quiet Hamster Exercise Wheel 100% quiet rotation, no noise. The wheel rolled smoothly and silently. It is also very convenient for pet jogging. Easy to clean Made of light, durable wood material, removable roller for easy cleaning, just use a little soap and water to wipe the smooth surface, it can be cleaned quickly and easily.