Feature●Ceramic media is made of a ceramic binder and an aluminum oxide abrasive grit●For use in grinding and polishing of hard metal work pieces●Use on steel, stainless steel, titanium work pieces●Extremely versatile for deburring machined, cast iron or fabricated partsDescription Ceramic Media, Shape Triangle, Size 5/16 In. x 7/8 In., Density 90 lb//cu.ft., Weight 20 lb., For Use With Vibratory Tumbler, Heaviest Media and Fastest Finisher for Rapid Deburring and Can Also Be Used for Polishing, Bonded with Aluminum Oxide