The Natural Rubber Bee Hive Reward Dog Toy is crafted from rugged and flexible natural rubber, providing a stimulating mental and physical playtime. They can lick and nudge the toy to their heart's content while being rewarded with treats that shake out as they play. The inner retention sleeve helps keep all the treats from pouring out of the top when flipped over. This toy is perfect for dogs who enjoy a fun challenge! It can also easily be cleaned in the dishwasher's top rack after use.