The product is a set of 4 Federal Mogul / Sealed Power hydraulic valve lifters, specifically designed for engines with the manufacturer part number HT2271. These lifters are essential components in the valvetrain system of a vehicle, ensuring proper operation of the engine by controlling the opening and closing of the valves. With the Federal Mogul brand reputation and the specific design for the HT2271 engine, these lifters are a reliable choice for maintaining optimal engine performance.