This 4-piece set includes developer units compatible with 3055C, 3555C, 4555C, 2000AC, 2500AC, 2050C, 2550C, 2051C, 2555C, and FC505.Model number: T-FC50.Colors included: Black, Cyan, Magenta, Yellow.Page yield based on 5% coverage.Defective rate is less than 0.5%.Packaging options include bulk, bag, or bottle.The toner appears as a fine powder with good tint and no agglomeration.The product has undergone mechanical testing for stability, environmental resistance evaluation, long-term performance validation (over one year), and print quality verification to consistent color output without stains or fading.