The dial rings I have made are made of plastic, in matching colors for the Chevron dials. The dial ring needs to be attached to the watch case by a small piece of double sided tape (included). This keeps it from rotating in the case.
If you have the SKX007, you already have a black one (with white minute stripes). If you own the SKX009, you have a dark blue one; the blue one listed here is lighter blue.
You can also use these to modify your SKX007 without the Chevron dial. The example pics are made without glass installed, so I could change the dial rings faster.