What does a set of strings run for that bad boy?
Probably not much for him. Chris Cardone is the owner/(part owner) of the Circle K string company (now called "Kalium" string company).
I think the bass is tuned Low F# and up in forths; with octave strings for each bass string. I'm not completely sure, but I think the high F string might be in unison with the other two "octave" strings.
This is a bass built by Oscar Prat. Oscar has also built a 15 string (triple 5) for Jauqo III-X and an 18 string (triple 6) for Scott Fernandez. Scott's 18 string bass was part of the inspiration for Chris having a 24 string instrument built.
The video posted above was taken at the Circle K (Kalium) string booth at NAMM. If you watch parts of the video you can see Scott Fernandez's 12 string bass on the far left.