CritterTrail Fun-nel Tubes attach directly to each other and to the inside and outside of your CritterTrail home. If you can imagine it, you can build it with CritterTrail Fun-nels! The tubes are available in four colors and in a variety of shapes and sizes so you can create a huge playground for your pet. Our Fun-nels Tee provides a fun choice of direction into your Critters Maze. Right or Left, Up or Down which way will they go! With CritterTrail Accessories, your imagination is your only limit.3.5L x 2.25W - UPC: 45125605709