JW® 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 non toxic, durable, rubber and super-stretchy. A do-it-all multi-purpose dog toy! It's a fantastic treat ball, wonderful training aid, great for fetch, toss and tug, chewing and teething.