Kaytee CritterTrail Fun-nels Tubes Accessories Value Pack Allows for expansion of CritterTrail habitats Includes: 1 - 1.75" Tube, 2 - 3.5" Tube, 2 - 10" Tube, 4 - Connector Rings Universally connectable 2.25" diameter and a variety of shapes and lengths For hamsters, gerbils or mice