With carabiner clips instead of open hooks at each end, the Knot Bone Adjustable Bungee not only attaches to your anchor points, it locks there. Instead of elastic that loses its stretch over time, the KnotBone Bungee has a durable, high quality cord that threads through each end. The #9 size adjusts from 48 in. to 10 in. and the #5 size adjusts from 28 in. to 6 in. Once you have it adjusted to the right length, secure it in place with a simple wrap-and-lock motion. There is a small self-clipping plastic caps on the cord ends to keep them in place once you have your load secured. No more pulling, stretching, and re-hooking to get the tension you want, job after individual job, the KnotBone Bungee stays right where you attach it, pulls securely to the exact length you need, and locks there.