In ancient times the "sling and stone" was sort of like a loaded weapon, and quite a valuable weapon if one had the skill to use it. The sling itself was usually made of wool, twined together, though some cultures used leather. In the middle there was a thick pouch (like a plaited thong) for holding and slinging the stone. The stones could be kept in a small pouch for rapid fire slinging. The user would place the stone in the pouch, hold both ends, waive it around the head, and fling it by letting go of one of the ropes. In the Bible "slingers" were part of the Israelite army like the archers.