jw pet proten™ hol-ee roller dog toy is an ingenious, patented honeycomb, web design plus natural, tough rubber gives the hol-ee toys the ability to offer multiple kinds of fun. with an added durable tennis center, the proten™ hol-ee roller dog toy provides hours of bouncy playtime. jw proten hol-ee roller makes it easy to hide a treat & turn it into a game of fetch! interact with your best friend today! intelligent ideas that keep the pets you love happy. durable natural rubber non-toxic great for interactive or solo play