I bought these as substitutes for the original factory machine heads on a Fender CN240-SCE thinline electro-acoustic classical. The factory tuners provided variable tension and were cheaply manufactured. However, the cost of first-class replacements was not justified and the Harley Benton alternative has proved to be an excellent economical compromise. Of course, there's an element of 'you get what you pay for', but for a guitar on the cheaper end of mid-priced, they are a significant improvement. Recommended.