Keep critical sample identification intact from bench to freezer with Brady self-laminating cryogenic polyester laboratory labels for the M21 platform. This cartridge is designed for environments where labels must remain readable after exposure to cold storage, handling, and repeated movement between workstations and preservation systems. The self-laminating construction wraps printed data under a clear protective layer, helping shield text from abrasion, moisture, and routine contact. That matters when you are labeling cryovials, tubes, and other small-format lab containers that must stay traceable over time. The 0.375 in width supports compact identification without crowding the container, while the 21 ft roll length provides practical throughput for recurring labeling tasks. Because this cartridge is built for the Brady M21 printer family, it fits into a controlled labeling workflow where consistency matters more than convenience. For labs managing regulated samples, research archives, or specimen storage, the value is not just durability — it is fewer relabeling events, fewer identification errors, and cleaner chain-of-custody records.