Assortment includes 15 blank anodized aluminum plates of mixed sizes, cuts, and 3 colors (Gold, Silver, Black) of engraving plates. This is a great assortment to keep on hand if you do any type of laser or rotary engraving. The large variety of sizes within the assortment allows you to have an appropriate size plate (and color) for many jobs at hand. Make your own engraved plaques with our anodized aluminum assortment. Uses range from engraved name plate, desk plates, commemorative plaque, and award plaques. Sizes may vary for each assortment. Engraving cutting depth 0.025mm / .001" Material Thickness; aluminum is 0.63mm / .025" . Two-sided anodized aluminum coating withstands outdoor use . Aluminum Brushed/Satin finish is non-reflective black finish . The engraving blanks come with a clear thin plastic coating to protect the engraving side of the plate and should be removed before engraving .