Avery j5103 25 online postage labels 135 x 38mm for smartstamp pack of 250 product description avery j5103 25 online postage labels 135 x 38mm pack of 250 labels for smartstamp no need to leave the office and join a queue for stamps or spend the last hour of each day franking you can create your own postage mark using the royal mail smartstamp software and avery labels you can produce postage labels online then all you need to do is print and apply online postage is a great time saver a