Oct 2, - Arizona's Choice; for custom laser engraving Solar Labels, Signs, Awards, Trophies, Wood Coins, & Wedding Gifts. We Engrave: Hydroflasks, Yetis. high quality metal engraved challenge coin mini metal cnc milling machine, US $ - / Set, New, CNC, Shandong, 4insure.us from Jinan Senke. You earned the coins, now display them in style. This Challenge Coin Display, is crafted from a single two-inch thick piece of black walnut. A stout and beautiful.