Upgrade your motorcycle or scooter's ignition system with this set of six NGK CR7HS 7223 spark plugs. Made of high-quality copper material, these spark plugs have a thread diameter of 10 mm and a hex size of 16 mm, making them compatible with a wide range of machine types, including street, off-road, dual sport, and custom trail motorcycles. Each unit has a voltage of 12 V and an installation depth of 12.7mm, ensuring maximum performance for your gasoline-powered bike. With interchange part numbers P-Z9HC, 4203, and UR3AS, these spark plugs are the perfect replacement for your old or worn-out ones. Trust only the brand that has been a household name in the automotive industry, NGK.