Crackle Heads Plush toys are covered in soft cuddly material with Crackle Heads Technology inside! JW's bottle ball is placed inside the fabric to provide the crackle sound & crunch that dogs love. A squeaker is also inside to add to the fun! The Crackle Heads Toys are a stuffing free toy covered in soft cuddly material with Crackle Heads Technology inside. JW Pet's patent pending Bottle Ball is placed inside the plush fabric to provide the crackle sound & crunch that dogs love. A squeaker in the belly adds to the fun! The Bottle Ball has no cap or sharp rings that can harm soft mouth areas. Crunchy & safe fun that dogs love. Perfect for Small & Medium breeds.