These half sheet Avery Shipping Labels are completely opaque, thanks to our TrueBlock technology. TrueBlock labels have a unique silver backing making them completely opaque and cover old information on your packaging including text, logos and torn courier labels. This technology enables you to save money on boxes and still send professional-looking parcels. Add your company logo and recipient details to the label using Avery FREE and easy-to-use Design & Print online software. The software also supports mail merge, serial numbers and QR / barcodes for all of your logistical needs. These shipping labels are compatible with laser printers and with Avery Jam-Free reliability, printer jams are a thing of the past. The label format is 199.6 x 143.5mm with 2 labels per sheet in a convenient pack size of 25 sheets.