Type:T27(flat) Layers: 4-14 Washer: 1 or 2 or as requirement Inner diameter: 16mm,23mm(Tolerance:0.1mm) Outer diameter: 75mm,85mm,90mm,95mm,107mm,117mm,140mm,170mm, 180mm Back: one black paper, or one layer non-woven cloth, or customers' own label Applications: Used as the backing pads of Flap Disc,Mop Disc and Flap Wheel. The excircle of backing disc id dealed with polishing without burr,The discrepanly of external diameter is less than 1mm,Can be customer-made diameter,thickness and layers. The angle of backing pads can be made in 8¡ãand 9¡ãalso twin plate. The backing plate surface can be made-in no-woven cloth and black paper. With many years of product experience,high quality and low price.we have win lots of foreign customer's confidence. 50 pcs in one plastic bag, 20 bags in one carton box, pallet.