Upgraded HSH Guitar Scraper Set. (K ohm resistance values are for reference only and will vary with temperature). 3 CTS 500K potentiometers, 1V 2T. In addition to the original functions, four single-knife switches and an enhanced switch bring new functions as follows. After turning on the single blade switch, if the single blade does not sound good, it will be better to use the compensation switch. PRODUCT SURFACE: The product is covered with a protective film to prevent scratches and damage. Be sure to remove the protective film before installing the product on your guitar.