The HellermannTyton 553-41252 wire labels & markers shrinkablemarker 3:1 (12/4 mm), UL-recognized, printable, black, 54m/box comes as part of a 3 reel package. These unique wire labeling markers are designed for use inside approximately a 12mm (standard) or 4mm (diameter reduced) flare, and are a quick, easy, and efficient way of identifying cables and wires while also providing protection from environmental damage. They can be printed with any headset/font to create a professional and easy-to-read label. Additionally, they are UL-recognized and manufactured in accordance with strict standards, ensuring that they are up-to-date on the latest safety regulations.