High-quality, bright white, address labels are environmentally friendly and compatible with laser and inkjet printers. Face sheet is made using 100 percent recycled post-consumer fiber and is processed chlorine-free (PCF). The adhesive meets the USPS specification USPS-2-1238 so it can be safely recycled. Return address labels are both acid-free and lignin-free, making them safe for archiving. They will not yellow. Formats are compatible with most popular word-processing and label-making software.