Size of label: 54 x 25 mm Type of label: adhesive; paper color: white; font color: black 500 pieces of permanent content Label width: 54 mm; Label height: 25 mm; Format: Rectangular Fit for printers that use direct thermal technology In line with DYMO Compatibility with LabelWriters 310, 330T, 400, 450, 4XL, and LW 550 Sort Address labels for shipping and returns Type of product: all-purpose labels