Fanala Unisex Dupont Bifold Waterproof Tyvek Paper Wallets Short Money Clips Material: Tyvek (Environment-Friendly) Size:7.9-inch long and 3.2-inch wide. Super-thin bifold wallet design made from tyvek, acid, alkali chemical corrosion are not afraid of most strong acids, strong alkali, salt. Waterproof and breathable, high strength, resistant to tear, from paper with full wet to dry completely done, shrink ratio is less than 0.01%. Anti-aging, lightweight and printable, with high resistance of light, -73 degree always soft.