Hol-ee Roller is a fun, versatile dog toy with the durability you've been searching for. Rubber gives it strength, bounce, and a soft texture The unique open design allows you to stash small treats or kibble inside for hours of entertainment for your dog. This is the top-selling dog toy in the line, it is nontoxic, durable, rubber, and super-stretchy. A do-it-all multipurpose dog toy! It's a fantastic treat ball, a wonderful training aid, and great for fetch, toss and tug, chewing and teething.