Our selection of Blue Velvet Steel Clamshell Gift Boxes from Air-Tite gives you elegance at a very affordable price. All boxes come with a blue velvet insert card except for the certified coin gift box which has a blue foam. Boxes are available for a single coin or a 1 oz. silver bar. The larger clamshell gift boxes can accommodate from 2 to 6 coins as well as a certified coin. Coins can vary in size from 13 mm to as large as 42 mm in size.