Material: The cat running wheel is made of wood, fine workmanship, durable, sturdy and stable. Cat Exercise Wheel: Heavy duty, silent, perfect for cats to run at home, exercise and play Design: Silent running wheel, quiet working and wear resistant, comfortable and relaxing. Feature: The cat supplies wheel is easy to install, scratching resistant, suitable for most cats. Gift: Great Gift Choice for your pets, cats, kitten on birthday, festivals, holidays, etc. Specification: S: 87cmx34cmx94cm/34.25inchx13.39inchx37.01inch, Suitable for Weight Below 3.5kg M: 90cmx34.5cmx100cm/35.43inchx13.58inchx39.37inch, Suitable for Weight 4kg to 5kg L: 96cmx36.5cmx107cm/37.80inchx14.37inchx42.13inch, Suitable for Weight 5kg to7.5kg XL: 110cmx36.5cmx115cm/43.31inchx14.37inchx45.28inch, Suitable for Weight Over 7.5kg Package Includes: 1Cat Running Wheel Note: Please allow slightly errors due to manual measurement and different monitors.