APPLICABLE and FUNCTION: Rabbits, Guinea Pigs, Chinchillas, Hamsters, Gerbils, Rats, Birds, Rodents and other small pets. Entertainment, decompression and grinding teeth for small pets. Gives your small rodent the prefect opportunity to play and work out! This is chew toys for rats,also a gerbil chew toys pack,and for hamster chew and for hamster chews teeth.