Avery Clear Addressing Labels give a professional finish to your mailings as it looks like the text has been printed directly onto the envelope. Whatever the colour of the envelope, these transparent labels virtually disappear. You can peel your favourite 21 labels per sheet along the perforation to expose the edges and apply to C6, DL and C4 envelopes in no time at all using the unique QuickPEELT feature. These clear laser labels can be used with black and white or colour laser printers. The label format is 63.5 x 38.1mm with 21 labels per sheet.