Scales use either just sharps or just flats when choosing between the two names for the same note, when this is possible. In a scale of seven different notes, each letter is used only once. This means that some scales have one or two notes named with a sharp or a flat even though they are played by white keys. In the "C♯" Major scale, for example, all the notes have names with a sharp: "C♯", "D♯", "E♯", "F♯", "G♯", "A♯", "B♯", "C♯". In this scale, "E♯" is the name for the note played by the key that plays "F" and the "B♯" is the name for the note played by the key that plays "C". The same notes are used in the "D♭" Major scale, but they all have different names: "D♭", "E♭", "F", "G♭", "A♭", "B♭", "C", "D♭".