Nylabone Durable is a long lasting chew designed for powerful chewers. Be sure to select the right chew and size for your dog's chewing style. Different dogs have different chewing styles, even within the same breed - one may be a stronger chewer and another more gentle, preferring a softer chew. Bristles raised during chewing help clean teeth and the cleaning action helps control plaque and tartar build up. Nylabone Durable Wishbone Chew Toys come in two sizes: petite 3 1/2"L x 2 3/4"W and regular 4 3/4"L x 3 3/4"W.