Critter Cruiser is an exciting pet powered exercise car for hamsters and gerbils. Critter Cruiser's adjustable racing wheel allows for the car to work in three different ways! First, when the Comfort Wheel is in the top position, exercising critters spin the Wheel and the Critter Cruiser remains stationary. Interactive fun begins by adjusting the Comfort Wheel into the middle position. In the middle position, you can watch your pet "drive" their Critter Cruiser across any flat surface. By adjusting the Comfort Wheel to the lowest position, the Critter Cruiser will work directly on Kaytee's Hamtrac. Our industry leadership inspires us to bring you quality, provide unmatched service, and create innovative new products—food, treats, bedding, toys, habitats, and accessories. Kaytee is committed to the comfort and safety of small animal pets, pet birds, and wild birds.