Great product if you need a little finer grit than 280 It is incorrectly listed as 400 grit when the back of the sheets says P400 grit which is FEPA/EURO compliant. The abrasive in this P400 paper is 42 microns, while the 400 grit is 30 microns. In comparison, 280 grit paper is 45 microns thick. Norton must inspect its packaging to ensure that the labels on the packaging are legible.