Sling and Sling Stones Recreations. Ancient slings were made out of leather or woven wool. Slings were probably not swung around the head, but to the side like a softball pitcher. The longer the sling the greater the distance the stone would travel up to a quarter of a mile with a 3 feet long sling. A sling stone could be hurled at a speed of over 60 miles per hour. Sling and Sling Stones Recreations. There were several different kinds of sling stones; smooth rounded rocks, clay, and lead. Before the Greeks, sling stones were larger, over 2 inches in diameter. The Greeks and Romans used smaller sling stones about the size of golf balls, and they made them out of other materials like clay and lead. At the time of David, smooth stones over two inches were used in slings about the size of a tennis ball (I Samuel 17:40). Buy the sling and sling stones together and save money!