The BRADY Aggressive Adhesive Multi-Purpose Nylon Labels with Ribbon are designed for use with M21 series printers. The nylon material, combined with an aggressive adhesive, ensures labels remain affixed in demanding environments. Each roll includes white labels and a compatible ribbon, facilitating immediate use upon installation. The M21-375-499 part number identifies this specific label and ribbon combination, offering a reliable option for organizational and safety labeling requirements within B2B settings.