Use for printing calculators, adding machines, cash registers and more. The only 20 lb. 2 1/4' X 150' single-ply bond paper rolls on the market and prevents paper jamming. Provides the best surface for clear printing of ink ribbons. These are the ideal paper length so you are not having to change the paper as frequently as you might with rolls at a fraction of the length. Made by Monroe, the inventor of the printing calculator in 1912.