Hesheng electronic has the long history of manufacturing network communications and cabling products for more than 15 years cat.3 Keystone Jack/RJ12 coupler/cat.3 connector/telephone jack4pin rj11/12 jack,Phosphor bronze with golden cladding,cat.3 Keystone Jack/12 coupler/cat.3 connector/telephone jack1.Housing material: PC UL94V-02.Insert material:flame retardancy ABS UL94V-03.PCB material: FR-4 ...