This pack includes five developer entrance seals compatible with part numbers B110-3091 and B065-3091.Designed for use in select printer models including 1060, 1065, 2060, 1075, 2075, 2051, MP 5500, 6000, 7000, 7500, 8000, 9001, and 7502.The seal installs directly into the developer unit to help prevent toner leakage and support uniform toner distribution, contributing to consistent print quality during routine maintenance or component replacement.