5 Lbs of 240 grit aluminum oxide. This abrasive is used in the Paasche Airbrush AEC, AEC-K, AECR & ER-1S etching tools. Can be used for etching hard surfaces like glass or metal or for lighter work like paint or rust removal.5 Lbs of 240 grit aluminum oxide Great for etching hard surfaces like glass or metal Fast cutting Made in the USA