This Playology Dual Layer Bone is the perfect entertainment for your busy pup. It has a softer exterior with a hard interior for a little give while chewing, but is highly durable. It is perfect for moderate to heavy chewers. Dogs' sense of smell is much stronger than their tastebuds, and scent is the main way they experience the world! The Dual Layer Bone is scented with Playology's Encapsiscent Technology for endless hours of entertainment. Playology embedded delicious and enticing scent at a microscopic level that gets released from the fibers of the toy as your dog chews. It is subtle so you won't notice the scent but your dog will! This toy is easy to wash and is made from dog-safe materials, free of lead, phthalates, and other harmful toxins.