Improve workplace safety with NFPA stickers that help workers understand the hazards of the chemicals they are handling These Right to Know / SDS labels are handwritable with ballpoint pens and permanent markers like Avery Marks A Lot UltraDuty Markers (handwrite-only and not compatible with laser or inkjet printers) Preprinted with an NFPA diamond as well as checkboxes for personal protective equipment requirements Durable and waterproof labels, these labels are also resistant to chemicals, abrasion, UV rays, tearing and harsh temperatures Tested to remain adhered for 90 days in seawater, these BS5609 Sec. 2 certified labels are built to last