It is a Window Lifter for 3 types of sedan, including totally as many 32 pcs of plastic parts assembled together in such small unit, it is made by 11 sets of mold and 3 different plastic material with variant shrinkage rate, some parts are very small with top precise dimension requirements (below 0.05mm), any slight tolerance deviation or burs is not acceptable as it may affect the function of press button after assembled High temperature requirement: After full assembly, those parts have to stay in -40c for 2 hours, and then transfer to +90c immediately and stay for 2 hours. In a result, the goods should NOT have any deformation and change. Also need very high requirement for oil painting and laser engraving on some parts.