1.Material:bakelite 2.Internal metal: copper,iron,aluminum,zinc alloy 3.Voltager:110-600V,4-6A 4. OEM is available Lamp holder E27: 1.E10,E12,E14,E27,E40 series etc 2.Metal: aluminium/iron/copper/brass 3.Professional ManufacturerE27 Porcelain Lampholder:1.Series: E12,E14,E27,E40 etc2. Inserted Metal: aluminium/ iron/ copper/ brass/ stain steel, by customer's choice3. OEM/ ODM are available4. CE/ ...