My daughter’s finished 23 button Rosewood Concertina reduced to 80 % of a normal size 6-1/4 inch instrument for her small hands. It has full length reeds which provide great sound but limited the number to the ones that would fit to those I thought most important. The highest reeds on each right hand row and the lowest reeds of the left hand row were left out as well as the right hand top row first button.