This range of racing spark plugs from NGK are designed to provide a reliable and powerful spark under race conditions. The plugs feature an ultra thin iridium electrode which has less resistance for a better spark with increased durability. The plugs are built to withstand extreme temperatures and RPMs which makes them a popular choice for OKJ / OK and KZ shifter kart racing.Provides a powerful and reliable spark to maximise engine performanceCapable of withstanding extreme temperatures and high RPMsDurable Iridium electrodes for a longer plug lifeThe NGK racing spark plugs are available in different heat ranges to provide optimum performance in various ambient temperatures:R7282-10 - Ideal for all round use in mild to average temperature conditionsR7282-105 - Ideally suited to warm ambient temperaturesPlease note - This range of plugs have a 19mm long thread and require a specific plug cap (NGK TRS1225)Sold individually.