Trio Of Fun Ball (Medium). Made from 100% natural materials, this trio of fun balls contains no glue, plastic or metal! Each pack contains three different balls, one made from natural seagrass, one from water hyacinth and one from rattan – all are safe to chew, gnaw and eat. Each ball is 8cm in diameter and helps to prevent boredom and stimulate most small animals, including: rabbits, guinea pigs, chinchillas, hamsters, rats, mice gerbils, degus and even ferrets! Suitable for all animals. Size: 8cm diameter.