Vidagoods 72" Cat Tree Play House Condo Scratcher Post Furniture Bed CARB2-Certified Wood Particle-Board Board Material : CARB2-Certified Particleboard Wood (The highest standard) Covering Material : Faux Fur 4 Posts covered by natural sisal rope. 6 Posts covered by Faux Fur. Cat house: Faux Fur Wall Post Diameter is 3.5" (less than 3.5" is NOT good enough strong)