Features: Crafted from premium 4N copper wire with ≥99.99% purity, this crossover inductor 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 eliminate magnetic saturation. this copper coil inductor ensures stable performances and distortion proof frequency transit for optimized crossover networks. Ideal for audiophiles, and professional auditory technicians reliabled components for loudspeaker crossover upgrades or auditory repair projects. Specifications: Component: 4N copper coil Wire diameter: 1.0mm Optional Type: 0.1mH/0.2mH/0.3mH/0.4mH/0.5mH/0.6mH/0.7mH/0.8mH/0.9mH 1. the "inductive reactance" value of the hollowed inductor is much lower than that of the solids inductor; Air-cored inductors are more suitable for applications with a wider frequency ranges, while solids inductors have serious frequency tendencies. 2. in the crossover, hollow inductance is generally used in the front stage, which theoretically allows 20~20KHz auditory to pass; After frequency division, only 20~1KHz, 1K~10KHz, 10~20Hz, auditory signals that have been "frequency divided" are allowed to pass through to achieve the purpose of frequency division output. Package Includes: 1PC 1.0mm red crossover hollow inductor copper coil note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution