XR4 introduced four-strand design, and is the first four-strand with a patented Coretec™ core. With a 3/8” diameter, it always feels right in your hands and right when you throw. Delivering more control and power, this unique design provides more weight and extra body for better tip feel and more accurate throws. Ropers know the XR4’s straight nylon core compensates for a less than perfect delivery. 30ft.