ProDot checks and adjusts cartridges to appropriate torque and tension to give minimum load on printer’s motor plus oil based ink of ribbon lubricates the pins of printer-head simultaneously at the time of printing.
Density of fabric is number of threads per square inch (reed and pick) and in ribbons normal or high is density of white/uninked ribbon (or fabric). Since DMPs come in two print-head pin options i.e. 9 pin and 24 pin, difference in them is printing quality. 9 pin printers capable of printing normal print quality requires normal density fabric whereas 24 pin printers capable of printing fine print quality requires high density fabric.
Fold or twist enables the printer to print from both the sides (top & bottom) of the narrow strip of inked fabric (i.e. ribbon). And direction of fold (CW-Clock-Wise or ACW-Anti-Clock-Wise) depends on printer cartridge model.