Refill HP 21, 22, 27, 28, 56, 57, 58, 59 OEM cartridges – It recommended that you purchase the Premium Refill Kit for HP15, HP45, and HP78. This kit includes specialized tools. The premium kit includes comprehensive instructions. This manual is intend for individuals who purchase a generic refill kit in bulk and intend to use it to refill HP 15, 45, and 78 cartridges.