Be sure to add me to your favorites list Genuine Yamaha OEM Replacement Part: Gray Knob / Dial with Green Top and Green Indicator Marker. For Many Yamaha Mixers (some M, MG, MX Series), and some Yamaha Speakers, Such as the MS400 Powered PA Speakers and Possibly Others. Made in Japan! This is a genuine Yamaha replacement part, a gray colored knob / dial with a green top and green indicator marker. This is used on several Yamaha Mixers such as the MX12 and others (I don't know all of the models, but you can compare yours to the photos) plus some Yamaha speakers as well. Here is an example of these types of knobs on a Yamaha MS400 powered PA speaker: The listing photos are 2 stock Yamaha photos so you can see exactly what these look like, plus 4 of my own photos for one of the actual knobs you're getting. I have a few of these available, all in brand new or near like new condition. Thanks for looking! Check out my Store!