What is the difference between old hook vine and double hook vine~!

The reason why the hook vine is called the hook vine is because there are hooks on each knot, when used, the knot will be cut off, remove the leaves and side branches, leaving only the hooks of the nodes, and dried in the sun for medicinal purposes. General hooks on each knot are only a hook, the old hooks as the name suggests is the growth of longer hooks, double hooks is a better quality hooks, each knot has two hooks, into the medicine to double hooks for the best