Funny hamster running wheel and ball design, lots of fun for your hamster. Movement: Alternative to free walking in the apartment - The hamster can go on excursions - Ventilation slots. Safe Material: Made of high quality material safe for animals. Relieves boredom and increases activity level and gives your pet a fun place to play. Encourages the little hamster to get healthy exercise in this running track, provides interactive fun for the pet and its owner. Funny hamster running wheel and balls design, lots of fun for your hamster.