Everlocking Treats provide the toughest chewing challenge yet! They are the first treats to "lock" into place as part of our interactive toy systems. These treats are made from irresistible natural ingredients without plastics or polymers, and are completely edible and digestible. Raised dental ridges help safely scrub your dog's teeth clean. Everlocking Treats are the perfect treat for dogs needing a new interactive challenge. Everlocking Treats fit the Everlasting Treat Ball, Everlasting Fire Plug, Everlasting Beanie Ball, and Everlasting Fun Ball.