The Genuine Authentic NGK 1090 BR6HS-10 Nickel Spark Plug Removable Tip 4 Pack is a set of high-quality spark plugs manufactured by NGK in Japan. Made of durable nickel material, these spark plugs feature a removable tip design for easy maintenance. With an interchange part number of 1090 BR6HS-10 BR6HS10, these genuine NGK spark plugs are essential components for optimal ignition systems in cars and trucks. The California Prop 65 Warning indicates the presence of nickel, a known allergen and carcinogen, in the product.