The JW® Hol-ee Roller® is a fun, versatile dog toy that lets dogs play in multiple ways! Made from soft, stretchy rubber, the JW Hol-ee Roller features a unique open design that lets pet parents insert treats, kibble, other small toys, ice cubes, or whatever else you can think of to create a mentally challenging puzzle treat experience for their dogs. Available in a variety of sizes, the Hol-ee Roller can be used as a training aid or for fetch, toss, tugging, and puzzle treat time. Ships in assorted colors. Stuff with treats or small toys to keep bored dogs occupied Provides mental stimulation Made from durable natural rubber Gentle on your dogs mouth Available Sizes: Mini (1.75"), Small (3"), Medium (4.5"), Large (5.5"), Jumbo (7.5")