comfortable cat tree Material:flakeboard+ natural sisal rope+cut pile carpet 1.Item:comfortable cat tree2.Size:(according to clients' requirements) 30(L)*30 ... inner we put a plastic post .It's strong enough. the sisal rope is durable for cats' scratching. with a hanging balls5 ... : rectangular pet bed, square bed, round bed, pet hammock, Igloo Cat Bed, snuggle pet bed, pet burrow bed, pet mat etc.