The OEM set of 10 head bolts for the 1990-2005 Mazda Miata, specifically designed for the NA, NB, and MX5 models, is a performance part manufactured in Japan by Mazda. These black bolts are engineered to enhance the performance of the vehicle's engine and components, making them a reliable choice for auto enthusiasts looking to improve the overall functionality of their Mazda Miata. With a focus on quality and authenticity, these head bolts are a genuine part that meets the standards set by the manufacturer.