3 treble and 3 bass, set of 6. Distinctive in styling and quality, the Imperialﾙ made itﾒs first appearance in the 1970ﾒs. The most notable feature of this unique machine head is the futuristic Three Step button, a fresh and funky design trademarked by Grover. This re-introduction if the Imperialﾙ is an exact reproduction of the originals, including a 16 to 1 gear ratio.