Discount Supply Company's compatible cartridge for the iX3, iX5 and iX7 mailing systems is a high quality, lower cost alternative to the OEM cartridge. This cartridge compares to the IXINK357 cartridge and only works in the iX-3/5/7 mailing machines. We proudly offer you a 90 day return window as we understand you can not wait until the last minute to order your backup supplies. We are an American company and have many years experience in the postal industry. Always reach out to us through your buyer account should you need assistance of any kind. We will reply to you promptly.