Complete set for 15-bar models with chord designation printed on each button. Buttons are (more or less) rectangular with one sloped side, chord name is printed on the slope. Chords included are Bb, C, D, Eb, F, & G major; A7, C7, D7, E7, F7, G7; Am, Dm, Gm. These are the only pre-printed buttons available from Oscar Schmidt in this style. Button must be glued to bar. NOTE: Use cyanoacrylate glue (superglue) to attach. Contact cement is NOT suitable  and will melt the button. HISTORY: This button style also used on some 12-bar, 10-bar, and 6-bar models. (12-bar, 10-bar, and 6-bar models have been discontinued for many years)