1. Size: 0.5", 1", 1.25", 1.5", 2", 2.5", 3", 4" 2. Material: Aluminum, Pure Oxygen-free Copper 3. Lay: 2 lays and 4 lays Round wire coils, Production sizes are from Φ5.0_Φ200mm.Round wire coils include 2 layers, 4 layers, 6, even up to 12 layers.And beyond with the option of winding these coils or any number of the layers to the internal side of the bobbin essentially an internal / external ...