This set of 10 NGK spark plugs is a must-have for any inboard engine owner. Made in Japan, these spark plugs are of high quality and designed to ensure optimal performance. The manufacturer part number for this set is BPR6EFS / W30225 / BPR 6 EFS13 / W30-225. NGK is a trusted brand known for its durable and reliable spark plugs. These plugs are designed to spark consistently and reliably, ensuring that your engine runs smoothly. Whether you're a professional or a DIY enthusiast, this set of spark plugs is a great choice for anyone looking to improve their inboard engine's performance.