Kinekt’s Gear Ring is sure to turn fingers as well as heads: this engineering-friendly bling is made with six tiny gears that rotate in unison when the outer rims of the ring are turned. The Gear Ring is made from high quality matte stainless steel. It features six micro-precision gears that turn in unison when the outer rims are spun (as can be seen in the video). It is currently available for purchase in four standard US ring sizes: 9, 10, 11, and 12. Sadly this ring isn’t cheap, it will run you $165 and you can purchase at their website found here.