The JJW Crunchy Collar series features a fun crunchy mechanism specially designed inside the toy, protected by a special foam material. It emits attractive and funny sounds during play, bringing you and your pet hours of fun. You can twist or break it in the way you desire, JJW Crunchy Toys will take any shape you want them to be and will keep your dog busy. A collar that transforms with a crunchy texture. Amazing crunchy sound!