HP C9381A 88 BLACK/YELLOW PRINTHEAD FOR OFFICEJET PRO K550 SERIES - Produce high-impact documents. HP's new printhead design makes HP's Scalable Printing Technology the preferred choice for the office. To keep pace with you, HP's new printhead is designed together with new HP 88 inks to produce prints with crisp black text, vibrant color and pinpoint accuracy—even at fast print speeds. HP Smart Printing technology in HP supplies and your printer ensures reliable, consistent results by making automatic adjustments that optimize print quality.