Voicing of Dominant 7 sus4

Drop 2 I

Back to C7sus4

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Left hand
C3
Right hand
G3C4F4Bb4
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Drop 2

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