The Lyman Rotary Case Stainless Steel Media provides superior brass case cleaning performance with stainless steel pins engineered to precise dimensions for optimum cleaning power.Lyman Rotary Case Stainless Steel Tumbling Media - 5 PoundsPrecision-made pins reach primer pockets and case interiorsStainless steel construction resists rust and corrosionCompatible with all brands of rotary case tumblersWorks with Lyman Cyclone Rotary Tumbler and other modelsPacked in convenient 5 pound boxesPerfect for reloaders seeking thorough case cleaning that reaches areas vibratory tumblers cannot delivering professional results for brass preparation and maintenance.