Dongguan Chengxinxing Smart Card Co.,Ltd is one of the best China barcode card manufacturers and suppliers with one of the famous brands, as a professional company, we have our own productive factory, which is able to produce CE certification barcode card at both low price and high quality. Welcome to buy discount or wholesale cheap products from us. Barcode Card Specification: Barcode is the small image of lines (bars) and spaces that is affixed to retail store items, identification cards, and postal mail to identify a particular product number, person, or location. The code uses a sequence of vertical bars and spaces to represent numbers and other symbols. A bar code symbol typically consists of five parts: a quiet zone, a start character, data characters (including an optional check character), a stop character, and another quiet zone. www.dgcxcard.com