KONG Ballistic is made using a patented, multi-layer design. Each toy has three layers of material (inner layer of 600 Denier Poly with PU Coating*, inner layer of 1050 Denier Ballistic Nylon with PU Coating* and outer layer of soft fleece) with eight rows of stitching to create a tough and durable dog toy. KONG Ballistic toys are gentle on teeth and gums and all toys squeak and float. Each squeaker is secured using individual nylon pouches inside the toy. KONG Ballistic - TOUGH enough to be called a KONG. *PU Coating is a water resistant coating that is gentle on teeth and gums and non-toxic .