JW Hol-ee Roller is a fun, versatile, durable dog toy. Made of rubber it is strong. bouncy and soft in texture. It's unique open design allows small treats or kibble to be stashed inside for hours of entertainment. It is non toxic, durable, rubber and is super-stretchy. A do-it-all multipurpose dog toy! It's a fantastic treat ball, wonderful training aid, great for fetch, toss and tug, chewing and teething.