Features PLAYOLOGY Dual Layer Bone Dog Toy scented with exclusive Encapsiscent Technology. Each Dual Layer Bone toy is infused with all-natural beef scent, made with extra durable dog-safe materials, and engineered for longer lasting play. Dogs love scent. Their sense of smell is 10,000 times more powerful than ours! As a Playology toy is chewed, the scent is released to keep dogs engaged - plus the smell lasts for at least 6 months! Extra durable, with a chewy outer layer surrounding a hard inner core to provide dogs with an enjoyable chewing sensation that mimics a real animal bone. Made with dog-safe materials. This toy is tested to meet ASTM guidelines for safety for children's toys and the CPSIA (Consumer Product Safety Improvement Act) standards for lead, phthalates and other toxins deemed hazardous. Treat free - Unfortunately, over 50% of U.S. dogs are overweight. Playology toys smell so engagingly delicious, you don't have to add food to make them interesting. After all, dogs shouldn't need food to play with a toy. They should play because they love it! Easy to clean and dishwasher safe (top rack, no detergent). Encapsiscent Technology assures you can't wash away that alluring scent.