Can be used to print handwriting or inkjet printers. If you download the dedicated index-dedicated printing software, you can easily align the labels. You can also choose a border pattern or color when using the blank label. The label itself is made of thick regular paper (about 0.14 mm). Postcard size (5.8 x 3.9 inches (148 x 100 mm)) is easy to set up with inkjet printers. Comes with a convenient gauge mat that allows you to attach labels almost equally spaced. Label Dimensions: 0.9 x 1.1 inches (23 x 29 mm); Paper Thickness: Approximately 0.05 inch (0.14 mm) (Total Thickness: Approximately 6.7 oz/yd2, 0.08 inches (170 g/m2, 0.20 mm)); *This label is compatible with the easy label printing software. Sheet Dimensions / Postcard Size: 5.8 x 3.9 inches (148 x 100 mm)