This ring is a one off, Z7 in size (25mm inside diameter) 15mm wide and 3mm thick. We have used a wing bearing from C-130J Hercules, the largest military airplane. Wing bearing itself is made out of titanium and afer treating it with heat we achieved beautiful colours, blues and purples. Wood insert come from Purpleheart. This wood when drys is changes colour from light grey, later to purple and with time to nearly black with purple tint. This is for a big hand.