These shelf sets are only compatible with the Borneo Cage Version II. The Borneo Shelf & Ladder Kit includes three heavy-duty solid metal shelves and ladders that attach to your pet's Borneo Cage. See options below:Standard Set (Version II)Only compatible with the Borneo Cage (Version II)Shelves measure 45" wide x 12" deep with openings 9" x 5"Ramp Ladders measure 21" long x 5" wideExpander SetOnly compatible with the Standard Set (Version II) Includes (3) shelf expanders - no extra ramp laddersAdd (1) Expander Set for every Borneo Cage Add-On unitThese shelves are designed with powder-coated steel material making them super durable, chew-proof, and easy to wipe clean. The shelves attach to the sides of the Borneo Cage with the included hardware. Suitable for a variety of animals such as sugar gliders, squirrels, chinchillas, prairie dogs, degus, or other chewing animals.