Black Mylar with a high nylon content making CareBlack bags very strong with good abrasion resistence. CareBlack provides a quality opaque barrier for FDA and industrial applications. Our CareBlack Black Stand Up Pouches have a high nylon content which provide an excellent barrier with a classic feel. Also the Opaque material blocks light entering the bag, extending light sensitive shelf life. It is great for various uses such as food, cookie, tea and many more.