Made from inert soft thermoplastic polymer, designed to satisfy the chewing instinct of moderate chewers * Bristles raised during chewing will help clean teeth and prevent tartar build up * Not recommended for strong chewers * Regular is recommended for small dogs up to 25-pound * Made from inert soft thermoplastic polymer, designed to satisfy the chewing instinct of moderate chewers. * Bristles raised during chewing will help clean teeth and prevent tartar build up. * Regular