Specification: Color: Magenta / Cyan, Black / Yellow, CMYK (Optional) Applicable models: for HP Offic jer PRO k5300 / k5400dn / k8600 / k8600dn / l7380 / L7580 / l7590lk5400dn / K5400dtn / K550 / K550dtn / K550dtwn / L7480 / L7680 / L7780 Size: 9.4 * 7 cm / 3.7 * 2.8in Weight: approx. 78-160g Package List: 1 or 2 * Print Head Note: Please remove the polishing cardboard nozzle and remove the orange rubber plug before installation.