" CritterTrail Loop-D-Loop is a fun accessory that you can add-on to any CritterTrail home giving your pet a fun area to turn and twist around and around! You will need to attach Loop-D-Loop to a 10" Fun-nels Tube, Item #60550, so your pet will be able to climb safely from their CritterTrail home into their Loop-D-Loop. Loop-D-Loops can also be attached to each other over and over creating a spiral of twist and turns."7.5"L x 7.5"W x 8.75"H"Please note: Color specification is unavailable on this item