Porelon 11206 PR74 Calculator Ink Roll, 1-Pack, Black is an excellent replacement or backup ink roll cartridge that is compatible with a range of calculator brands that use ink ribbons. Made by Porelon, the black ink cartridge is model PR74 and is sold in a pack of one. The cartridge has dimensions of 2.25 x 4.5 x 6.75 inches and weighs 0.64 ounces. The country/region of manufacture is unknown. This ink is an ideal choice for calculator use and provides uninterrupted productivity even in the event of an empty cartridge.