Pellet Pins Magnetic Stainless Steel Tumbling Media Ultra 47's - 5 Lbs New Product, .047 Magnetic 304/302 Stainless tumbling media for rotary or magnetic tumblers. The longest lasting media on the market, won't damage brass. Stainless pins are magnetic for easy separation. Best Wet Brass Cartridge Case Tumbling Media Use in all brands of wet tumblers i.e. Lortone, Thumler etc.