YHM was established in 1979. The main products include copper alloy wires, such as brass wire, phosphor bronze wire, silicon bronze wire, nickel silver wire, and EDM wire. The wire material is produced using advanced metallurgy technology called Upcast (Upward Continuous Casting). This technology, similar to semiconductor grain size growth, results in highly purified material with uniform grain size and no joints in the jumbo coil. This enhances electron transmission, ensuring stable voltage and current, which is advantageous for EDM wire products.