The connection cables are not run through the inside of the pipes, however cable clips (6) and cable ties (3) are included with the MDS-GND2, which can be used to attach the cables neatly to the outside of the stand pipes.
For more information about the included connection cables, please see the related Q&A "Connection cable length specifications?".
Additional notes:
- The USB connection cables for the PD-140DS, CY-18DR, and VH-14D digital pads are not included with the MDS-GND2, however one is included each digital pad box.
- The included TOM 4/AUX 1 cable is a 1/4" female connection type. To connect a pad to it, use a PCS-series V-Drums cable. https://www.roland.com/us/products/pcs-5f_10f_15f/