Corn cob based media treated with polishing compound. Corn Cob Grit also serves as a burnishing media offering slight polishing. Universal fast acting dry polish for brass, silver, copper, titanium, stainless steel, etc. Corn Cob is a biodegradable tumbling grit and is used as both a tumbling and vibratory media to absorb dirt and oils and dry parts, without affecting the surface of the parts. Corn Cob base as pointed irregular particles.