The ferplast krolik wood extension is the perfect addition to your rabbit cage the sturdy bottom tray collects droppings and food residues and can be quickly removed for easy cleaning the removeable roof has a metal clip to keep it closed and upper hooks to fix the extension onto the side of the cage krolik wood extension provides increased space and a relaxing hideaway for your pet with a design featuring ventialtion holes for adequate air circulation click here for product assembly instruc