Per HP953XL CISS per HP 7740 8210 8710 8715 8740 8720 8725 8730 con chip ARC
Step1: Open the bigger plup ,and refill ink into the ciss tank. Chip Type: With ARC Chip, Permanent Chip. For HP OfficeJet Pro 7720. For HP OfficeJet Pro 7730. For HP OfficeJet Pro 7740. For HP OfficeJet Pro 8210.