High Quality Customized Barcode Sticker Label Universal Product Code UPC Labels are used to identify a wide variety of retail products. UPC Barcode Label are mandatory for most retailers so they can manage the products that are sold. International Standard Book Number (ISBN) labels and International Standard Serial Number (ISSN) labels are often used to identify products produced by publishing companies such as books and the accompanying CD’s/DVD’s, computer software, and magazines. We factory can customize Label Sticker.