Dot matrix printers are a traditional printing technology that have been widely used over the past few decades. This type of printer creates images and text on paper by moving one or more needles in a specific pattern. Dot matrix printers are suitable for many different types of printing tasks, including invoices, receipts, labels, and more.

1. 76mmx70mm (3 inches x 2.75 inches)

Printing paper of this size is commonly used in accounting machines in POS (point of sale) systems that take customer orders. Printing paper of this size is also used in equipment such as drawings, register memories, and automated teller machines (ATMs) and cash dispensers.

2. 76mmx76mm (3 inches x 3 inches)

This is a common printing paper size. It is usually used to print small labels, product price tags, express delivery orders, access cards, etc.

3. 76mmx152mm (3 inches x 6 inches)

This is another common size for printing paper. Printing paper of this size is usually used for printing stamps, express bills, access cards, etc.

4. 101.6mmx152.4mm (4 inches x 6 inches)

This is a relatively large printing paper size. Printing paper of this size is commonly used for printing photos, stickers, access cards, etc.

5. 210mmx297mm (regular A4 size)

This is the standard A4 paper size, but can also be used on dot matrix printers, typically used for printing invoices, receipts, orders, etc.

6. Other sizes

In addition to the above sizes, there are many other printing paper sizes available, such as 80mmx80mm, 76mmx279mm, etc. These sizes are generally suitable for different application scenarios, such as printing tickets, invoices, labels, etc.