Resin segment for grinding disc 1 500# 800# 1500#, segment 2 Welded on grinding wheel ... for rough grinding, 50#, 200#, 400#Resin-bonded Disc: fine and finish grinding/polishing. 500#, 800#, 1500#, 3000# productGrit PerformanceØ100mm(4 ... /price ratioResin disc500#,800#,1500#,3000#Shape, good durability, nice polishing effectionPolishing disc(black,white)smooth polish, glazing fast, delightness