2 Compatible Toner Cartridges for OKI Data B401 in Combo Pack. For OKI B401d / B401dn / MB441 / MB451 / MB451W Page Yield: 2,500 Pages per Toner @ 5% Standard coverage Rate on A4 Page Size. Excellent Quality Manufactured By ISO 9001, ISO 14001, CE, & REACH Certified Manufacturer To Ensure Best Printing Quality & Page Yield. PRINTOXE® Brand 100% Compatible in Retail Package Shown in Image. Shelf Life exceeds 36 Months.