Magnets, Ferrite Cores & Bobbins Smoothen rough edges & prevent chipping & dusting. Provide a low friction interface, which speeds up coil stringing & winding operations. Eliminate insulation stripping from magnetic core windings. Enhanced strength & corrosion protection and provide a insulating layer between the wire and cores. Penta Technology (Suzhou) Co., Ltd accepts custom-built Parylene coating system and also we supply Parylene dimers.