Caidi Compatible InkJet Printhead Cartridge for HP OffceJet Pro K550 (HP 88) Black/Yellow Packing List: Remanfactured 1 PACK Black/Yellow HP88 Printhead usually need 5- 12 days to deliver. The printers are compatible: HP office jet Pro K5400. K5400dtn, K5400dn K5400tn,K550,K550dtn, K550dtwn, K8600, K8600dn The printers are compatible: HP office jet Pro L7550, L7580,L7590,L7650,L7680,7750, L7780, L7500 Any questions,please email us.