Holds a Variety of Treats and Kibble. Use with Starmark Lock & Block Treats in each end.  Increase the challenge by adding smaller treats inside.  Lock & Block Treats made in USA.  Made with Virtually Indestructible Material. Great for powerful chewers.  Free of latex, vinyl, and phthalates. Nubby surface helps clean teeth and gums.  Dishwasher safe. Made in USA.