What is/are in the package? 24-Pack Compatible ERC 30 34 38 Ribbon (Black/Red) 100% Quality Guarantee: 1. Product under ISO9001, ISO14001 standard 2. Full refund for defective items Functions and features: GTS ribbon cassette is suitable for cash register / POS, with clear writing and smooth typing Cost savings by replacing manufacturers' parts What are the compatible printers? ERC-30 ERC-34 ERC-38 M17-JB M52-JB M63-UA M115A M119 M119D M133A M188B M270 TM-270 Printers TM-300A TM-300B TM-300C TM-300D TM-U200, TM-U200A TM-U200B TM-U200D TM-U210B TM-U210D TM-U220 TM-U220A TM-U220B TM-U220D TM-U230 TM-U300 TM-U300D TM-U325 TM-U370 TM-U375 What is the warranty? GTS offers money back warranty on defective ribbon cassettes What is the shelf life? Please store the unused/unopened GTS ribbon cassettes in a dry and cool place. Avoid sun exposure Have a question or a problem? Please do not hesitate to contact us, our Customer Services Team will usually response your email or message within 1-2 business days.