The PC-404RF, which comes in a pack of 4, is a ribbon compatible with specific FAX models. - Model: PC-404RF - Quantity: 4 ribbons - Compatible Models: FAX-800 series, FAX-2000 series, FAX-1100 series, FAX-9000 series, FAX-770 series, FAX-7000 series - Replacement Method: Living replacement method This product contains 4 ribbons, each equivalent to 144 A4 sheets (217mm wide, 47m long). Features: This type is designed to be refilled into the cassette currently in use. Compatible Models: Compatible with various Brother FAX machines, including the FAX-900 series, FAX-1000 series, FAX-1100 series, FAX-2000CL, FAX-2100 series, FAX-30CL, FAX-780 series, FAX-790 series, FAX-720 series, FAX-730 series, FAX-306V series, FAX-V6 series, FAX-K78CL, FAX-K79 series, FAX-KJ7CL, and more.