The r31 jettec hewlett packard hp black refill kit is simple and easy to use save money by refilling your empty cartridges jettec refill kits come complete with easy to follow instructions 3x 30ml bottles of black ink and 1x bottle of cleaning fluid the quality of jettec products is second to none jettec is also an iso 9001 registered company and iso 9001 procedures are applied throughout the entire manufacturing process