High quality, bright white printer labels are environmentally-friendly. Face sheet is made process chlorine-free (PCF). Adhesive meets the USPS specification USPS-2-1238 in order for it to be safely recycled. Compatible with both desktop laser and inkjet printers. Acid-free and lignin-free. Safe for archiving and will not turn yellow. Shape: Rectangular; Label Size - text: 1.33 x 4; Label Color(s): White; Color Family: White.