An assassin's ring with a gap in the bottom to activate a hidden blade. The ring itself is about 20.98mm wide, that should translate to 11 1/2 ring size in the US.

Ring Based on Ezio Vambrace and Hidden Blade from Assassin's Creed.

Vambrace rotates to reveal hidden blade design on band.

US Sizes 6-12 (in Half Sizes)
US Sizes/Inner Dia

The rings in the video/pics have been detail painted. The Shapeways parts will NOT be painted. The parts will be one solid color.
Painting Guide

Choose US Ring Size:
Size 6 (This Listing)
Size 6.5
Size 7
Size 7.5
Size 8
Size 8.5
Size 9
Size 9.5
Size 10
Size 10.5
Size 11
Size 11.5
Size 12

New Year, new assassin's, new ring! Unavailable in silver, since the design making it difficult to produce in silver(for now).