Compatible with: ET-8500 & ET-8550 Page Yield*: 6700 For best results, store in a cool, dry place. Use within 24 months of purchase for optimal performance. *at 5% coverage (ISO/IEC standard) Quality tested to ensure long-lasting use and bold, vivid print on every page Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.