Our Birddogz Pro Check Cord is a must have! This checkcord is made with a smooth finished, tightly woven, solid-core nylon rope made in 7/16'' diameter for sure grip. There is a sturdy, solid brass bolt snap attached with a bow line knot . This cord is incredibly strong and stiff and won’t stretch or get caught up on obstacles in the field. It will age and stiffen nicely over time.