Fifty million sets. According to the query of Northern Lights official website, it has a history of 24 years in the automobile film market and is trusted by more than 50 million car owners. The thickness of the full-function thermal insulation safety film of the car model is 4 mils, which is 2 mils thicker than that of ordinary windows on the market. The 1 1 layer magnetron sputtering process is adopted to endow a unique safety substrate, which greatly improves the penetration resistance of the window glass, improves the glass strength and protects it by 8 times. It has spectral shielding control ability and super heat insulation ability. Metal coating composite technology makes the window film eliminate strong shock wave. The unique safety base layer and the unique molecular structure of its polyester film make the window film have the greatest toughness. Aurora borealis is a window film brand under Kangdexin Group, which started with 1998. From the name of the brand, it is destined to deal with "light" and has a passionate pursuit and unremitting exploration of light.