The product is a set of fuel injectors and a rail pressure regulator specifically designed for 2003-2008 Mazda 6 Six vehicles. These OEM parts are not universal fitment, meaning they are tailored for a gasolina fuel type and are not vintage or performance parts. With stock number M125 3977, this set of fuel injectors is a reliable and high-quality component for maintaining optimal fuel delivery in your Mazda vehicle.