Style 137U keys, C-E-G-B group, for Roland keyboard. These keys must be installed as a group, and each octave (C through B) on the keyboard is made up of three groups mounted together: C-E-G-B group, D-F-A group, and black keys group. This piece is Roland part number 5100064169, and will replace any C-E-G-B group on the keyboard.

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