The MDY12 is a cymbal arm for Roland electronic drum kits. This handy cymbal mount fits all Roland MDS Drum stands such as those for TD-4, TD-9 and TD-12 kits. It enables you to add an additional cymbal pad to your rack with a flexible clamp system for easy position adjustment.
Here's what Roland say about the MDY12 Cymbal mount
Expand your drum kit with the MDY-12 cymbal clamp and mount
The MDY-12 is a cymbal mount for V-Cymbal Pads. It features a flexible ball-clamp, a foldable boom arm, and a hatched clamp that’s compatible with all Roland MDS-series drum-rack hardware for expandability. Set up and teardown is fast and easy.