Material:Wood Color S(17.5cm) Target species: Guinea pig, Hamster, Chinchilla Safety Material: This hamster wheel is made of high quality natural wood, which is safe, environmentally friendly and has not undergone any chemical treatment. The widened and thick wooden base greatly prevents spills in providing reliable and stable support for this exercise wheel 【Completely Silent】: This wooden wheel is silent, ensures quiet and smooth rotation when pet plays with this wheel, it won’t disturb you, it provides a fun place for pets to play and rest Multi-function: This wheel is not only a toy, but also a chew toy for pets, it can help massage their gums and promote dental health, it provides excellent teeth grinding effects, c ‘is also a fitness tool Suitable size: This wheel has two sizes to choose from, size S (outer diameter 15cm, inner diameter 14.4cm, base width 9cm, height 17.5cm) Wide Compatibility: Fine workmanship, corrosion resistance and sturdy, durable and long service life,