The top of each of these shelves has multiple layers of fabric. Our cats climb on them and jump around the wall with ease. Its a great way for them to reach higher shelves or just to stretch on after a long nap. Cats love the rougher feel of the Burlap fabric, which they can lounge on and scratch their face with. When we were mounting the shelves for the first time in our home, Ickle fell asleep on one of the 18 shelves on the ground. I have since taken the brackets off and left it there for him, for when hes feeling too lazy to climb up the wall to get to a shelf. We have heard customer stories of cats flying across the room to jump onto these. The burlaps amazing grip will allow most able cats to pull themselves right up onto the shelves. Our 18 shelves come with two brackets attached, meant to be mounted into studs 16 apart. If you have different spacing between your studs, let us know when you order. All of our furniture also comes with screws. These shelves are very sturdy and have been tested to hold 85 lbs. Dimensions: Width: 18 Height (including brackets): 4 Depth: 9 Pictured is a shelf with Red Mahogany-stained wood and gray burlap fabric.