The Lowing Products 10 pound shot bag contains #409 Stainless Steel shot. The shot in this bag is highly resistant to corrosion. As with all our shot bags, these are built with real Cordura nylon fabric. Cordura has proven to be the most resistant to the everyday abrasion that our shot bags will endure. It is useful with projects involving a less chemically aggressive environment such as chlorinated and fresh water. These bags can be easily rinsed with fresh tap water.