CoolFun design keeps pets entertained and enriches their environment by providing new and different places to play and hide.Compatible & ConnectableUniversally connects to all CritterTrail, Habitrail, and S.A.M. systems.ColorfulHas fun colors kids love and dark translucent colors for your critter's comfort. Includes:1-Lazy Look-Out1-Fun-nel J-Tube2- 3.5" Fun-nel Tubes2- Connector RingsStart Collecting and Connecting Today