1. You can print any thermal label stickers with a width from 3cm (1.18") to 10.4cm (4.1"). Please noted that the label is thermal paper. 2. Please design your label and save your label as a pdf or images on your phone first. Please measure your paper size and crop your size on the app. 3. Please click this link 'How to print different size and shape labels' . There is an instruction for you.