The Plus Ergo Grip is ONLY compatible with the Wacom Grip Pen and Wacom Pro Pen.
Wacom Pro Pen
Wacom Pro Pen is included with the following Products:
Cintiq Companion Hybrid
Cintiq Companion 2
Wacom Grip Pen
Wacom Grip Pen is included with the following Products:
Cintiq 21UX (DTK2100)