plastic air vent louver 1.material: PP 2.firm,cheap,durable,good ventilation 3.offering several kinds of air grilles supply linear diffuser,linear diffuser grille,diffuser air supply hvac linear diffuser linear ceiling diffuser linear air conditioning diffuser Shaping Mode: plastic injection Mould Steel: S45C, P20, 718, 718H, 2738, 738H, NAK80, SKD61, E420, etc. (For Reference)Mould Base: LKM or ...