Two Levels of Difficulty Use our unique Everlasting Treat with Dental Ridges or original domed Everlasting Treat in the top cavity, or push into the lower cavity for more challenging play. Made with Virtually Indestructible Material Stronger than rubber and great for powerful chewers. Free of latex, vinyl, and phthlates. Provides Hours of Challenging Play Treat ball system encourages play which helps reduce anxiety and boredom behaviors. Treat Insertion Tip Dab entire edge of treat with water, insert at an angle and push down. Best to let dry before giving to dog.