Crafted from premium 4N copper wire with ≥99.99% purity, this minimizes internal resistance and transmission loss. Delivering pristined auditory transmission for enhanced high frequency detail and superior sound clear in loudspeaker systems. Featuring precise calibrated inductance with ±5% tolerance and a hollow cored design to magnetic saturation. this copper coil ensures stable and distortion frequency transit for optimized networks. Package includes: 1PC 1.0mm red hollow copper coil