The three key factors for roll size are width, diameter and length. The most popular width is 57mm (2 1/4″) and 80mm (3 1/8″), while 60mm, 70mm & 110mm for some other printers. For the diameter, it varies from 30mm to 250mm. Here comes length of roll. In a fixed paper roll size, such as 80x80mm, the lower paper gram mage is, the long meters this roll contains. You can use this roll for longer time.http://www.rosethermalpaper.co....m/thermal-paper-roll