RubberTuff toys are made from dog tough virtually indestructible rubber. The nubby surface helps clean teeth and gums and is great for powerful chewers. Available in three sizes and comes packaged with new Lock & Block Treats. Lock & Block Treats are made in the USA and lock in place on the toys for chewing enjoyment. Increase the challenge by filling with small treats or kibble inside. Dishwasher safe for easy cleaning. Free of latex, vinyl, and phthalates. HOLDS A VARIETY OF TREATS AND KIBBLE: Use with our Lock & Block Treats, and increase the challenge by stuffing or freezing treats or kibble inside. DOG TOUGH: Made from durable rubber and great for powerful chewers. PROVIDES HOURS OF CHALLENGING PLAY: Treat ball system encourages play which helps reduce anxiety and boredom behaviors. MULTIPLE SIZES: Large for dogs over 40 pounds; Medium for dogs under 40 pounds; Small for dogs under 15 pounds. Sizing up is recommended for extra strong chewers TREAT INCLUDED: Comes packaged with one USA-made chicken flavored Lock & Block Treat. COOL TREAT: Freeze treats inside for a chewing challenge or a cool treat! TEETH AND GUM CLEANER: Nubby surface helps clean teeth & gums EASY CLEANUP: Dishwasher safe (top rack recommended) or hand wash. MODEL NO - SMRTBAL