Be sure to add me to your favorites list Genuine Yamaha OEM Replacement Part, Black Colored Knob / Dial with a Yellow Marker Line, for the Yamaha 80's Era "10M", "10M II" and "20M" Series of Guitar Effects Pedals, Made in Japan in the 80's and Early 90's. This is a very good condition replacement part for some 80's vintage Yamaha 10M and 10MII series of guitar effect pedals, and also the 20M series as well. This listing is for one of the knobs / dials used in these types of pedals, and it has a yellow marker line on top. It fits the D shaft stems that these pedals have. It is a genuine Yamaha OEM part, made in Japan! Please see my photos to see what this looks like. Price is for one of them, but I have more than one available if you needed them. Thanks for looking! Check out my Store!