The product is a set of 1990 Harley FXRP FXR FXRT FXRD Evo Super Glide lifter blocks. These lifter blocks are specifically designed for Harley-Davidson motorcycles and are used in the valvetrain system to control the movement of the engine's valves. Constructed by the reputable brand Harley-Davidson, these lifter blocks are known for their durability and reliability in maintaining the proper function of the motorcycle's engine. Ideal for riders looking to replace or upgrade their existing lifter blocks, these products are essential components for smooth engine performance.