Fiber Washers Assortment, 600 Pcs Red Steel Paper Fiber Flat Washers Kit Assorted Insulation Gasket Fiber Washers Assortment, 600 Pcs Red Steel Paper Fiber Flat Washers Kit Assorted Insulation Gasket Material: Made of high quality red steel paper, with good strength and corrosion resistance. The Red color. Good insulation performance. Flat washers can distribute a load, prevent damage to the surface to be fixed and insulate steel screws. Come with a compact and transparent plastic storage . Use on motherboards, PCBs and printed circuits. Package includes: 600 pieces in total. There are many different sizes in this set which can meet your different needs.