not to take away from this product, but if you were unaware a lot of "guitar knobs" or "volume knobs" made for music related things (guitars, amps, etc) fit the stems on keyboards too. and that opens up wayyyy more options, usually at a significantly lower price too. amazon, etsy, ebay all have lots to pick from. just have to make sure the knob isnt too wide and is for the same diameter stem on your kb, i think 6mm is pretty standard, at least thats what fits on my gmmk pro.