Paw-FRIENDLY SURFACE: The TRIXIE wooden running wheel offers a closed running surface with cork cover, which is particularly paw-friendly and offers the animals pleasant running conditions LIGHTWEIGHT AND QUIET: Thanks to the ball bearing, the running wheel runs very smoothly and quietly, making it ideal for use in the pet area without making any disturbing noises CLOSED BACK WALL: The running wheel has a closed back wall that prevents small animals such as dwarf hamsters and mice from injuring themselves while running NATURAL MATERIAL: The running wheel is made of untreated wood, which makes it particularly environmentally friendly and safe for pets DIMENSIONS: With a diameter of 21 cm and a tread width of 7 cm, the running wheel is perfect for dwarf hamsters and mice. The overall dimensions with holder: W 21 x H 24 x D 10 cm