Specs: Spark Plug, Plug Type: Resistor, Pack of 10 Replaces OEM Numbers: NGK: 4421, BKR4E Trusted Seller: Stens is your go-to seller for quality and reliability. With a strong reputation for excellence, we offer a wide range of premium products backed by our exceptional customer service. Stens branded parts are trusted by professional dealers to perform OEM quality repairs. The Stens name is featured on all Genuine Stens product packaging.