Pellet Pins Magnetic Stainless Steel Tumbling Media 5lb Bag Best Wet Brass Cartridge Case Stainless Steel Tumbling Media Pellet Pins Stainless Tumbling Media are produced from type 302/304 stainless steel, hardness in the 45- 58 Rockwell C range. Stainless pins are magnetic for easy separation The longest lasting media on the market, won't damage brass. Can be picked up with a magnet. Rust Free. Use in all brands of wet tumblers i.e. Lortone, Thumler etc.