We have the capability to adjust and test the composition of Al alloy through spectrometer. Before casting, we will test the composition of Al alloy for each furnace to ensure that the raw material is qualified. At the same time, we are using ultrasonic detector to detect the adhesion of the Alfin (100% test), using the X-ray detector to detect the quality of oil gallery (100% test). In addition, the key dimensions and appearance of the piston are fully inspected. After surface treatment, we will do appearance inspection again (100%).