The BCW Storage Box is the highest quality, most competitively priced cardboard storage box on the market today. They are constructed of white corrugated paper and have a 200 lb. test strength. Use this box to store and protect collectible trading cards like: baseball cards, basketball cards, football cards, Magic The Gathering, Yu-Gi-Oh, Pokemon, and others. These boxes also work well for storing or mailing groups of slabbed (certified) coins. Individual boxes are sold and shipped folded and assembled. Bundles of 50 boxes are sold and shipped flat (unfolded).