http://www.kinektdesign.com. The patent pending Gear Ring is made from high quality matte stainless steel (designed by Ben Hopson and Glen Liberman). 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 ten standard US ring sizes: 5 to 14. It can be purchased at http://www.kinektdesign.com.