These 4 x 4-3/4" labels carry the required "UN3373 Biological Substance, Category B" designation and UN identification number mandated for compliant air transport of Category B biological substances under DOT and IATA regulations. The printed format meets marking requirements for diagnostic specimens, cultures, and other materials classified under Category B criteria.

The roll format suits high-volume labeling environments including clinical laboratories, hospital shipping departments, diagnostic reference labs, and research institutions that regularly prepare regulated biological shipments for air transport. The 3" diameter core fits standard tabletop and wall-mount label dispensers, supporting consistent throughput in busy shipping areas.

Each roll contains 500 labels and is sold per roll. Compatible tabletop and wall-mount dispensers are available separately for facilities requiring a complete dispensing solution.