Material: Our cat running wheel is made of wood, compact, 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: Removable and Washable Cover Cloth, scratching resistant, suitable for most cats. Gift: Great Gift Choice for your pets, cats, kitten on birthday, festivals, holidays, etc Specification: Material: wood Size Chart: (optional) Size S: approx 87cmx34.5cmx94cm/34.25inchx13.58inchx37.01inch, for under 3.5kg cat Size M: approx 90cmx34.5cmx100cm/35.43inchx13.58inchx39.37inch, for 3.5kg to 5kg cat Size L: approx 100cmx36.5cmx107cm/39.37inchx14.37inchx42.13inch, for 5kg to 7.5kg Size XL: approx 110cmx36.5cmx115cm/43.31inchx14.37inchx45.28inch, for more than 7.5kg Package Includes: 1Cat Running Wheel Note: Please allow slightly errors due to manual measurement and different monitors.