The Yaheetech Cat Tree Tower Kitten Condo Scratching Post with Hammock Tunnel 51in is an interesting and fun way to add some activity to your home. These cat trees and condos provide a perch for your kitties to nap or play, and they’re made of engineered wood that’s safe for them to chew on. The multiple scratching posts are covered by natural sisal ropes, and the top one has a diameter of 31 inches.