2 1/4" X 50'
Thermal Paper Rolls 2.25 X 50 Ft, 5 Rolls Credit Card Paper Thermal 2 1/4″ X 50′
Among others, that require 2 1/4 x 50 thermal paper rolls Red Warning Line at the End of The Thermal Paper Roll: There is a red warning line at the end of each roll of credit card paper to remind you, so that you will not accidentally use up the paper.