Lightning Labels carry over a dozen labelling materials for you to choose from, including several eco-friendly materials such as Bio Stone, Recycled Kraft and Recycled Vellum. Their most popular material is White BOPP (a polypropylene label stock that is water-resistant and impervious to oils). They also carry Clear, Chrome, Removable, and Ultra Removable versions of BOPP. See their Instant Quoter for an explanation of all available materials.