Blank bars for the 12 or 15 'B' style Oscar Schmidt bar or the 'C' style for 21 bar instruments. Each comes with blank button. These are used chord bars with new felt. The chord bar name is removed, and we can apply a vinyl label if you indicate this in the notes at checkout. We can also mark the felt for your chord for a standard chromatic string schedule. You would then put the bar in place, check the marks and make any adjustments needed, then notch the felt. 
For instructions on how to notch the felt, and for a chart showing what notes are in the chords, got to this page: http://daigleharp.com/howtocorner.html