Sixth Sense is a six-banded puzzle rings, conceived by Bram Cohen and developed by Oskar van Deventer. This is a set of seven different sizes: 52, 54, 56, 56, 58, 58 and 60. Note that these are European size, indicating the inner circumference of the ring in millimeter.
Watch the YouTube video
Read at the Shapeways Forum
Please contact Oskar directly if you want to order a dyed batch or if you are interested in a quantum discount.