The RISOGRAPH S8188UA 2 PACK 227MM X 109M MASTER is a genuine/original thermal print technology toner cartridge in black color compatible with various RISO printer models such as SF5, RZ5, EZ2, and others in the 2 Series. This product is designed for use in EZ/RZ/MZ LTR format printers and ensures high-quality printing performance with each pack containing two cartridges for extended use. Ideal for professionals in need of reliable and consistent printing results, this product by RISO delivers on its promises of compatibility and efficiency.