The handmade Portfolio Boxes are made of top quality and sustainably sourced American Walnut. It's the same material that has been used for furniture in the Louvre, Palais de Versailles and Buckingham Palace! The tempered glass provides a crystal clear, safe and easy to clean viewing window. The whole interior of the box is fully lined in a luxuriously soft, almost suede like material. This gives it a very high quality look and also adds a level of protection to your matted prints. This product has been designed so that the USB sits neatly into the lid so you can access it quickly and easily. These crafted portfolio boxes have been designed to last for generations.