Cord with saddles at each end to fit over limbs, to facilitate the safe and easy stringing of the bow, and to prevent damage to the bow or archer.

a basic accessory for the archer that can be made using common materials in a very short time

If you have a bow, you need to have the string on. The most common type of Stringer is made of a cord with loops and/or cups to hold the bow limbs in place. This will enable the archer to position the string on the bow nocks safely.