The PHOENIX CONTACT ZB 13 CUS is a customizable Zack marker strip designed for easy identification and organization of terminal blocks. This strip comes in white color and can be labeled according to customer specifications. It is designed to snap into the tall marker groove of terminal blocks with a width of 13mm. The lettering field size is 13 x 10.5 mm, allowing for clear and legible labeling. Each strip includes 5 individual labels, making it ideal for efficiently labeling multiple terminals.