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: 1.1 x 1.3 inches (27 x 34 mm); Paper Thickness: Label Body: Approx. 0.006 inches (0.14 mm) (Total Thickness: Approx. 6.7 oz/yd2, 0.08 inches (170 g/m2, 0.20 mm)); *This label is compatible with easy label printing software. Sheet Dimensions / Postcard Size: 5.8 x 3.9 inches (148 x 100 mm)