This is our 1st generation Small Raceway. If you would like to see the 2nd generation Cat Mod Lift (with steps included), which includes our new removable fabric and cat mod attachment options, follow this Link Our cats use these raceways to run around the house and to lounge on. Our large 16 lb cat Ickle enjoys laying on the upper area. We started feeling bad for how cramped his robust body looked between the 16 inches of fabric, so we built him the larger raceway. He now uses the larger one to run along, but still prefers the fit of this bed. Scroll down to see a video of our cats playing King of the Castle on this raceway. Heisenberg thinks its his and he found Ickle laying on it. We use solid wood for the shelving and mounting posts, and thick heavy weight canvas for the hammocks. All of the brackets come attached for easy installation, and all of our furniture also comes with screws. Each fabric section has been tested to hold 62 lbs, and each wooden plank has been tested to hold 85 lbs. Each raceway is built to be mounted along three consecutive 16 studs. (If your studs are spaced differently, let us know before ordering and, if necessary, well build you a custom piece accordingly for an additional fee.) We have new easy-to-wash, waterproof marine canvas! With this fabric, cat hair and other debris wipes off quickly with a wet towel If you want this option, just select a fabric that says “Waterproof” in the drop-down. Dimensions: Total Width: 34 Total Height: 16 Depth: 11 Pictured is a Small Raceway with White Wash stained wood and Waterproof Light Gray fabric & Onyx-stained wood and Black fabric.