Hol-EE Rowler is a fun, versatile 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. JW Pet Hol-EE Rowler Dog Toy is a non toxic, durable, natural rubber, super-stretchy multipurpose dog toy. It's a fantastic treat ball, wonderful training aid, great for fetch, toss and tug, chewing and teething.