Ribbon cartridge is designed for use with Brother ML/AX Series, GX Series; SX Series; ZX Series; EM30, 31, 31-11, WPT Word Processors; Compactronic 300, 310; Correctronic 140, 145, 300, 300M, 310, 320, 340, 360, and 380. Black nylon ribbon yields 250,000 characters at 5 percent coverage.