... Networkwell sold in North Africa, Middle East, Asia, East Europe and America, Algeria, Tunisia, Egypt, Libya, Ukraine, Arab , ... Singapore , Viet Nam, USA and NicaraguaTestingLab Testing and Road Testing before Massive Production During the Production, each ... Ceramic Half Metal Semi metal Less Metal H4H Characteristic1) Asbestos and Non-asbestos 2) No Noise 3) Long life with 30000 ...