Description: Material: Our hamster running wheel is made of wood and cork pad, durable, sturdy and stable. Hamster Exercise Wheel: Silent Hamster Wheel is perfect for hamsters to run at home, exercise and play,allows your animals run comfortably and happily without noise. Stable Base Stand: The base is very stable and durable, silent running wheel, quiet working and wear resistant,perfect for hamster habitat decor. Replaceable Cork Pad:The cork pad has good foot feeling, increases friction and is convenient for hamsters to run. Methods of replacing cork pad: 1. Carefully find the butt joint; 2. Tear along the butt joint; 3. Replace the cork pad with a new cork pad Application: Exercise wheel is an essential accessory for hamsters, suitable for animals such as dwarf hamsters, gerbils, hedgehogs, and other small animals etc. Specification: Material: Wood, cork Pad Size Chart: Small: 17.8cmx15.5cm/7.01inchx6.10inch, depth 5.9cm/2.32inch Medium:23.3cmx20.5cm/9.17inchx8.07inch, depth 7.9cm/3.11inch Large: 28.5cmx25cm/11.22inchx9.84inch, depth 9.8cm/3.86inch Package Includes: 1 Piece Hamster Running Wheel Note: Please allow slightly errors due to manual measurement and different monitors.