The unpredictable bouncing drives dogs crazy. This tennis ball dog toy has an elastic core and a soft nylon webbing exterior for strength and durability. Bunched up, the the toy is about 23" long, and stretched, it's over 36". It's a great size for larger dogs. This tennis ball dog toy is also great for two dogs to play with together. Available in assorted colors - please let us choose. All of our dog toys are 100% made in the USA and guaranteed against any workmanship or material defects.