Caldwell Shooting 598458: High-quality, Universal shooting bags. Can be used with most Brands of front rests. Top-grain, black leather. Available filled with ground Walnut shells or unfilled. Empty bags should be filled with fine dry sand. Narrow: for most sporting rifles. Medium/wide: accommodates the wider for ends of varmint & bench rest rifles. Rear: supports the toe line of the stock for rock-solid positioning.