JW Pet Hole-ee Rollers are unique and innovative toys that give your pet a special play experience. These toys are made from natural rubber that has been certified as non-toxic to ensure that they are safe for your pet. The rubber used is also durable to ensure that your toy lasts your pet many sessions of extended play periods. The unique hollow design of these balls also allows owners to insert treats for added fun. The JW Pet Hole-ee Roller is extremely flexible and moderately bouncy to provide your pet a one-of-a-kind play experience. This Hole-ee Roller is the smallest size with a 2.5-inch diameter- but there are also medium and large sizes available.