The strings of the SPD series are processed by the original materials imported from the United States, Japan and other regions. In order to meet the high-quality standards of the masters, the company adopts the high-precision digital control device developed by the company to process and produce the anti-crack treatment. And strict quality control and control, to create a string of sound pronunciation, sweet sound quality, durability, fair price and other competitive advantages. SPD series of strings is the best choice for the musical instrument industry and enthusiasts.