... socket,lampholder,lampbase 2)main material:porcelain 3)fittings:copper,aluminu,zinc alloy 4)certificate waterproof lamp socket,lampholder,lampbase1) product name ... : CE,ROHS.3) voltage:250v-750v; electric current: 4A-16A;4) main material: high pressure & ceramic, common ceramic, porcelain;5) metal:copper ...