1, Grade: WaL/W1 ( AL) 2, Diameter: φ0.4-1.3mm 3, Number of strands: 1-10(strands) 4, Difference between 2 feet (mm): Big heater element: ±2mm; Small heater element: ±1mm 5, Inside diameter tolerance: ±0.3mm 6, According to the samples or drawings of customers