Lyman Tufnut media is rouge treated crushed tasty nutshells for use in tumble method case polishing. It turns out brass that is bright, clean and ready for reloading. It is supplied in an 18 lb bucket. Lyman is an industry leader that continues to develop innovative products for shooters and reloaders. They produce some of today's most respected reloading handbooks and a broad range of reloading and bullet casting supplies.