Automobile Spark Plugs: 1.Strong resistance to heat and shock 2. Multi-ribs of insulator eliminate flashover. Automobile Spark Plugs: 1. Multi-ribs of insulator eliminate flashover.2. Insulator made of 95% pure alumina, strong resistant to heat shock, great mechanic and electric features, super insulation.3. Nickle plated housing prevents oxidation and corrosion, heat crimping process ensures ...