The product is a set of four Bosch WR6DC spark plugs designed to fit Porsche models from 1976 912E to 1985-1989 911 Carrera. These copper spark plugs have a thread diameter of 14mm, standard configuration, and a voltage of 12V. Manufactured in Germany, they are performance parts that offer improved ignition quality, making them suitable for gasoline fuel type engines. Additionally, they come with a California Prop 65 warning due to the material used in their construction. The Bosch brand ensures reliability and quality for your vehicle's ignition system needs. Exact item set is shown. Vintage new old stock spark plugs. Original packaging may have a musty odor from storage. Bosch WR6DC is a standard spark plug with a 0.8mm (0.031") gap, a 14mm x 1.25mm thread size, and a 6 heat rangeSet weight 9 oz. Made in Germany. No returns on installed items or partial sets. Please review our business policies in our store for information regarding returns, shipping and warranties. Most items have 30-day returns along with free fast shipping in 1 business day (see details). Message us anytime. Buy from a trusted 16+ year seller!