The HyperGnaws Disk is durable enough for the strongest chewers and the ideal size (8.25") for any dog. It's perfect for playing fetch (indoors and out) and is a great training aid. The center of the Disk contains a squeaker and is covered with a durable suede fabric while the rest of the toy is a tough woven nylon fabric. The soft non-toxic fabrics are easy on your dog's mouth.