If your dog loves to chew, then hes going to love the PetSafe Busy Buddy Ultra Stratos. Knobbed rubber ends are molded over nylon with a textured rubber center for extra chewing satisfaction. Holds two ultrathick rawhide treat rings (four included) that are four times thicker than the regular Busy Buddy rawhide rings. Since the diameter of the toy matches the treat rings, its harder for dogs to get a tearing grip on the rawhide. Designed to hold a dogs interest for hours of fun. Made of durable nylon and vanilla-scented rubber with ends that unscrew to replace treat rings over and over. Not compatible with standard Busy Buddy treat rings. Dishwasher safe for easy cleanup. Sizes: Small For dogs under 10 lbs. Medium For dogs 25-50 lbs. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Size: BUSY ULTRA STRATOS S. Type: Toys.