Ultimate Support Stands MDS-X Expander for MDS-100The Ultimate Support MDS X Expander for MDS 100 is a small modular connector piece designed to link two MDS 100 desktop stands together and turn them into a two tier studio setup. Its part of the Ultimate Support MDS 100 Modular Desktop Stand system, mainly used for synths, drum machines, controllers, and audio gear. What it actually does Connects two MDS 100 stands into a stacked configuration Lets you build a second level (2 tier rig) for more gear