Max Power is massiv and available in all sizes between 15.0 and 22.5 mm inside diameter.
If you got any questions or adding wishes to the ring - just press "Contact Designer" on top or mail to email@example.com and tell me your desire.
Shapeways Material Portfolio
If you don´t know your ringsize in mm this links may help you:
Size at 22.5 mm inside diameter:(under the video)