The Cat Mansion Blackline Light Grey cat tree is one of the most popular cat trees. Its many lying and playing areas are every cat's dream. The sisal poles are 5 inch thick, making it very stable and sturdy. It also has a large lounge lying area of 24 x 17 inch, a lovely soft 18 inch hammock and a huge hideaway, making it suitable for large (pedigree) cats and energetic kittens.