ISINK34 Neopost Ink Cartridge Postageink.com products are exclusive and other companies do not sell our products. You can depend on the service and reliability you receive from Postageink.com, so make sure it is sold and shipped by Postageink.com or Fulfilled by Amazon from Postageink.com for True Postageink.com Quality. Sure.jet 4135554T / ISINK34 Ink Cartridge is a direct replacement for Neopost # ISINK34 OEM Sure.jet 4135554T Use with Neopost - IS330, IS350, IS420, IS440, IS460, IS480, IM490 Postage Meters Total Imprints IS330, IS350 - 6,500 / IS420 - 8,000 / IS440 -15,000 / IS460 -17,500 / IS480/90 -19,500 Imprints or 18 Months Be careful of cheeper prices, there are inferior imported knock offs. Postageink.com only sells Postage Meter Ink and Guarantee 100% Satisfaction. Make sure it is sold and shipped by Postageink.com or Fulfilled by Amazon from Postageink.com for True Postageink.com Quality!