brother is a company with a long tradition that has long been producing printing devices such as printers, fax machines, typewriters and multifunction devices. of course, it also produces various consumer accessories for its products. the advantage of genuine accessories is 100% product compatibility and maximum print quality that cannot be achieved with non-genuine accessories.lc121bk is a black print cartridgee for brother inkjet printers dcp-j132w/dcp-j152w/dcp-j172w/dcp-j552dw/dcp-j752dw. this ink yields up to 300 pages yield at 5% standard coverage.the advantage of the original cartridgee is 100% product compatibility and maximum print quality that cannot be achieved with non-original cartridgees.