... 100mm,115mm,125mm,150mm,180mm,230mm Velcro backing Silicon Carbide Velcro Disc Grain Backing Diameter X Hole sizeGrit ... No.SI. Velcro 36406080100120150180240280320360400VELCRO DISCS100MM/4.0"X16MM 115MM/4 ... weight paper, craft or latex paper, Norton paperMaterials: aluminum oxide, silicon carbide, zirconium oxide, zinc-stearateColor: white, brown, yellow, ...