The Eastwood Sandbag and Mallet combination is the ideal way to beat and shape metal panels without nicks or gouges, and with very minimal stretching. The sandbag is made of suede top cowhide, all-leather construction with double-stitched, glued seams. Hook-and-loop closure makes it easy to fill through your funnel with dry sand or steel shot. As a metal-forming tool, you cannot "beat" the Eastwood 2-1/2 inch Teardrop Mallet that's included for panel beating and metal shaping. It is constructed of ultra-high molecular weight plastic to prevent marring, with a fitted wood handle.