NGK (6544) IMR9D-9H Spark Plug - Pack of 1 Size: One Size Style: SPARK PLUG GROUP Color: Multi-Colored Warranty: NGK Spark Plugs warrants that the products shall be free from defects in workmanship or materials. Except in the case of damage or defect attributable to NGK Spark Plugs, the Distributor, seller, reseller, or customer shall have no claim against NGK Spark Plugs for any damaged or defective product or part. In the event that any products or parts shall prove to be defective in workmanship or materials within a period of sixty (60) days from the delivery.