Compatible High Capacity Ink Cartridge Set for PostBase Mailing System Provides up to 23,000 impressions, depending on applications, and usage Compatible with all PostBase Models, 20, 30, 45, 65 & 85 Mailing Machines. DOES NOT WORK IN POSTBASE MINI OR MYMAIL. OEM part # 643956933307 Plus Your Tapes and Sealing Solution are included FREE! You have just found the best deal anywhere!