Kaytee Critter Trail Fun-nels Value PackKaytee CritterTrail Fun nels Value Packs are the perfect way to start expanding your CritterTrail home. If you can imagine it, you can build it with CritterTrail Fun nels! Fun nel accessories for turning CritterTrail habitats into tube cities Includes 3 tube sizes (5 tubes total) and Fun nels rings Endless combinations and possibilities The tubes are available in four colors and in a variety of shapes and sizes so you can create a huge playground for