This quick change disc improves productivity due to down time reduction. Its resin fibre backing offers superior performance for weld grinding, deburring, blending and most grinding applications. Warning : Cancer and Reproductive Harm -www.p65warnings.ca.gov/search/abrasives www.p65warnings.ca.gov/wood Safety Info : www.p65warnings.ca.gov Zirconia alumina is a man made abrasive and its products are typically in green or blue color. A blocky shape grain has a micro-crystalline structure. Zirconia aluminas self-sharpening characteristic gives good life on heavy stock removal applications, i.e. heavy grinding of metals,  planing operations for wood.