The C suspended fourth seventh chord is a 4-note chord consisting of the notes C, F, G and Bb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as C7sus4.
Chords that are a superset of C7sus4. The chords include more notes but always C, F, G and Bb.
Chords that are a subset of C7sus4. These contain less notes but all of them are included in C7sus4.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the C7sus4 chord. Feel free to save or share the image as needed.