abrasive nylon disc brush 1.Dupont A technology 2.Used for marble pretreated granite limestone travertine or artificial stone Silicon carbide round disc abrasive ... silicon carbide abrasive brushes adopt from DuPont U.S.A(Nylon 612 with grit inside),it has the advantage of high ... #,24#,36#,46# ,60#,80#,120#,180#,240#,320#,500#. nylon round disc brush