I tried to find the thread that first mentioned Spin-Caps valve caps, but with no success. Thanks to whoever did it. In any event they are billet aluminum valve caps that are put on with a "key" so that the outside spins and will not allow one without a key to screw off the valve cap. They look nice, come in several styles and color striping, and of course, help prevent tampering with the tire air valve. They are available at http://www.spin-caps.com . They come with two keys and are presently on sale. Following are a couple of pictures of the "tri-cut" caps with no coloring.