dymo label writer paper

Paper has dark squares, measuring 0.3mm by 10mm
Spacing between the squares is 8mm,
And the placement of square from paper margin is 8.5mm
This format tell the printer that paper is compatible with label writer.
It also ,perhaps, gives the machine an idea of whereabouts of paper, i mean guide for printer about the paper flow speed.

Now, the cut mark in paper, tells the printer and perhaps the pc software is communicated too, about the size of label.
This cut piece measures 2.5mm by 8mm.
It is for sensor of printer perhaps.
It is placed 2mm from paper margin.