1.Space Saving Door Mounted Cat Shelves:Vertical door mounted takes a little space and is the for small home or small apartment. Notice: Please that the door is or equal to 3 millimeters and the door thickness is less than 55 millimeters 2.4-levels Platform for Entertainment:Cats have jumping abilities, multi-levels activity area entertains and helps cats in physical training, they do enjoy running up and down, scratching it and hanging out on the shelves as well 3.Sturdy & Well Made & Holding up Well:It is made of sturdy multi-layer board. Each plank can support a 15 lbs cat and the whole can support 4 cats at the same time 4.Perfect for Active and Height-loving Cats:Each plank can hold up to 15 lbs. Give your cats 1-2 weeks to get used to it. You could place a few loved toys or treats on the to teach cats how to navigate the change between levels Tip: Wooden products may have slight color differences from the picture Specification:A:Cat Head -1.7meters Color: Wood Color Material: wood Package Contents: 1 x Door hanging tower Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.