Be sure to add me to your favorites list 1980's Vintage Casio Keyboard Slider / Selector Replacement Spare Part for Some "PT" and "MT" Model Casio / Casiotone Keyboards. This is a slider selector / knob from an 1980's vintage Casio keyboard. These were used on several of the smaller Casio models, (with model numbers starting with PT and MT) to control volume / tempo / effects. These usually slid vertically, but there may have been some models that slide side to side too. Unfortunately, these are very easily lost on some models, so here's a replacement if you needed one. The length of this slider is 17 millimeters long, the width is fraction over 5 millimeters, and the rectangular tab on the back of it where the stem on your keyboard fits into is 4 millimeters long. This slider is light gray, and is identical to some others that I had last year that were black. Many stems on the smaller PT and MT model Casio keyboards will fit this, but check yours first, or ask and I might be able to help as well. This part is in very good condition, and you can get one or more if you like. Thanks for looking, Check out my Store!