51" Cat Tree Play House Solid Condo Scratcher Post Furniture CARB2-Certified Wood Particle-board Board Material : CARB2-Certified Particleboard Wood (The highest standard) Covering Material : Faux Fur 3 Posts covered by natural sisal rope;2 Posts covered by Faux Fur Cat house: Faux Fur Wall Post Diameter is 3.5" (less than 3.5" is NOT good enough strong)