MaterialWood Target SpeciesGuinea Pig, Mouse, Gerbil, Hamster Small Size for Hamster WheelS size: 6.1 x 3.74 x7inch/15.5x9.5x18cm(Lx W xH) , 6.1inch/15.5cm Diameter drum wheel, with 1.97inch/5cm track wide; highly recommended for dwarf hamsters, small gerbil, mice, and other similar-sized pets, fits for them whenrun without bending their backs. Silent & Dual Ball Bearing DesignDesigned by wooden with a very low noise level (around 40dB) and dual ball bearings, so can quiet keep it on spinning smoothly, even your little friends working out on the hamster exercise wheel in the night time,you still have a sweet sleep. Safe & Chew Out MaterialThe gerbil wheel made of high quality wood, which are durable and safe chew out. It not only serves as exercise toy preferred for small pet sports activities but also as chew toy, offers excellent pet teeth grinding effects. Sturdy SupportThe non-tipping stand gives this wheel a firm stand, widened and thickened wood base greatly avoids reversal through providing reliable and stable mount for the exercise wheel. Must-have Hamster Cage Accessories Helps your hamster exercise more and develop balance ability and agility. Your furry critter will love this hamster wheel toy as Hamsters love the hamster rolling wheel like a runner to help them to broken boredom& enrich their nighttime, also keep them to exercise for maintaining their strength and well-being.