Gasket Is Made Of Insulation Plastic And Can Used On The Main Board To Prevent Electrical Shorts From Metal-To-Metal Contact.It Is Used To Reduce Pressure And Friction, Prevent Leakage, Isolate, Loosen Or Disperse Pressure. It Is Also Used To Increase The Contact Area, Reduce Pressure And Protect Parts And Screws.It Is Generally Used Under The Head Of a Bolt Or Nut To Provide a Smooth Bearing Surface.