TrueBlock´┐Ż Technology completely covers everything underneath, so you can reuse mailing tubes, boxes and more. Jam- and smudge-free guaranteed! Smooth feed sheet edges prevent adhesive build-up that causes jams. Quick-drying sheets prevent smudging. Label Size - text: 3 1/3 x 4; Label Color(s): White; Border Color(s): N/A; Design: N/A.