Our treated media is ground corn cob blended with industrial-grade cleaning and polishing agents. Works extremely well on recently fired cases as well as older dirty case. The untreated media is ground corn cob that is great to use as a final dry polish, but also can be blended with your favorite additive like Rooster Bright Case Polish, Flitz Tumbler Media Additive and Lucas Oil Gun Metal Polish to make a great cleaning media. Mfg: Sinclair International