fiberglass net backing disc, for making flap disc, to match ISO ... ,23454,6 Product description: Type:T27(Flat) ,T29(Convex)Material: Fiberglass fabric impregnated with phenolic resinWasher: 1 or 2 or as ... Flap Wheel.Shipment: by 20 feet ocean container. key words:fiberglass backing,fiberglass backing plate,backing pad,polishing pad backing