abrasive nylon flat brush 1.Dupont A technology 2.Used for marble ... silicon carbide abrasive brushes adopt from DuPont U.S.A(Nylon 612 with grit inside),it has the advantage of high ... #,36#,46# ,60#,80#,120#,180#,240#,320#,500#. abrasive nylon stapled set disc brush