Kaytee CritterTrail Fun-nels Value Pack #4 Mixed, , 3" high 7" wide Allows for expansion of CritterTrail habitats Includes: 1 - 1.75&quot; Tube, 1 - 3.5&quot; Tube, 1 - Tee Tube, 3 - Elbow tubes, 1 - 10&quot; Tube, 8 - Connector Rings Universally connectable 2.25&quot; diameter and a variety of shapes and lengths For hamsters, gerbils, or mice