KONG Sea Shells provide a dynamic chewing experience with a round outer shell that rebounds when squished. Adding to the fun are crackle sounds that reward and delight your dog\'s natural chewing instincts. KONG Sea Shells offer wave after wave of fetch for interactive play or a chewing experience that offers an ocean of solo play. Durable shell springs back for captivating chew sessions. Crackles when crunched to satisfy natural instincts. Easy to grab legs, ideal for tug, toss and fetch.