Just like the hard weights, Sea Pearls lead shot is manufactured from lead that has been reclaimed from car batteries. The reclaimed lead is melted down and supplemented with small amounts of other elements to enhance its properties. This new alloy is then used to create #4 lead shot. The shot is carefully measured and sewn into heavy-duty nylon mesh bags. Weight amounts are clearly designated with large numerals in the center Label includes a UPC bar code for retail sale, or to scan the weights into or out of the rental department Double needle stitching Quick draining and drying...... For more technical Details Click here