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Contact SupplierThe Inner Lead (which supports the filament), Press or Seal (which provides the glass-to-metal seal), and the Outer Lead (which is directly connected to the power source). For most the 3-part and 2-part lamps, the inner lead material is mostly made of Nickel Plated Steel (NPS) or Nickel Plated Bronze (NPCuSn) or Nickel Plated Copper (NPC) wire. The NPS wire is also used as a support wire in Standard Fluorescent Lamps (FTL).These wires confirm to the relevant customer specifications or international standards, as per requirements. The wires are available in various DIN Spools from DIN 80 to DIN 355 depending on diameter of the wire and the customer's requirement.