Note: 我們生產鋁合金后端蓋5年, 2018年產量達到37萬只,2019年預計達到50萬只,主要運用于汽車空壓機。We produce end cover for 5 years, sold 370,000 in 2018 and an estimated 500,000 in 2019, mainly used on automotive air compressors.