Our Cobalt Chrome Celtic Knot Wedding Band is a refreshing variation of the classic celtic knot design. We engrave our Cobalt Chrome deeply and highly polished, then the tops are beadblasted so that the pattern really shows. Cobalt Chrome Metal Values: Cobalt Chrome is a very popular, new fine metal for wedding rings. Cobalt looks like shiny platinum, yet has extreme hardness. Your Cobalt Chrome metal will serve you well. It will stay beautiful & won't tarnish. Cobalt Chrome is also a hypo-allergenic metal making it a great alternative metal option for your fine jewelry wedding ring.Other mm widths available upon request. **PLEASE READ** No Returns / No exchange. Lashbrook DOES DO NOT SIZE-EXCHANGE. Please research your ring size with comfort-fit sizing gauge.