Nylabone Dura Chew Bone, Liver Flavor, Regular This liver flavored, long lasting chew is made from injection-molded nylon, and is especially designed for strong chewers. Made in the USA. Regular Designed for powerful chewers Bristles raised during chewing help clean teeth and control plaque and tartar build-up This long lasting chew for small dogs up to 25-pound has an irresistible liver flavor