Internet shipping labels are ideal for use with stamps.com, ups.com, usps.com and other online shipping websites. Bright-white label stock produces sharp text and vivid bar-code images. Half-sheet labels feature permanent adhesive and are acid-free, archival-safe and lignin-free to prevent yellowing or becoming brittle over time. Labels are easily formatted in popular word processing programs. Each sheet includes two labels. Letter-size sheets feed automatically from your printer's input tray.