YSP1030 Features: * Snap on wheel * Safe and quiet operation means very little disturbing noise * Removable waste collector cup keeps the pet"s area clean and sanitized * Bubble wave fun nels design features a comfort grip that is safe for your pet"s paws * Universally connectable, easily attaches to all Critter Trail, Habit rail and S.A.M. systems * Easy to clean * Snap on wheel is 6.75 diameter Options: * Available in assorted colors Dimensions: * Width: 4.5