3M™ Fibre Disc 581C features an alumina zirconia abrasive on a fibre backing that’s closed coated and resin bonded. Our discs offer a good performance, consistent quality finish and are packaged on a reusable disc clamping system, for easy storage and retention of disc shape and form.Conveniently packaged with 50 discs on a reusable disc clamping system, for easy storage and retention of disc shape and form.