Voicing of Dominant 7 sus4

Drop 2 III

Back to C7sus4

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Left hand
C3C4
Right hand
G4Bb4F5
Family
Drop 2

The Drop 2 III voicing of C7sus4 stacks C, G, Bb and F from the bottom up: the root, 5th, minor 7th and 4th of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for C7sus4 are Drop 2 I, Drop 2 II and Drop 2 IV.