Sun Auto manufactures solenoid switches using high temperature copper wire and heavy duty silver or copper stud contact. It is loaded test by computerized equipment. The company offers the most comprehensive selection of solenoids-over 700 part numbers solenoids. It has sold over 40,000 pieces of solenoids in the field. We do testing for major critical parameters and 100% of production listed for major critical parameters. We use F-class insulated copper wire.