... disc, to match ISO standard Type:T27(Flat) ,T29(Convex) fiberglass net backing disc, for making flap disc, to match ISO ... ,617022,23454,6Product description:Type:T27(Flat) ,T29(Convex)Material: Fiberglass fabric impregnated with phenolic resinWasher: 1 or 2 or as ... plastic bag,then it will be put into durable carton box.At last a certain number of boxes will be put ...