1PCS DR411 Drum Unit For 223 283 363 423 Copiers Drum Kit The DR411 Drum Unit is designed for use with models 223, 283, 363, and 423 copiers.Each unit is tested before delivery to proper function.The drum unit is securely packaged to prevent powder leakage and damage during transit.Packaging may vary due to production updates, but such changes do not affect product performance.The model number should be verified according to the printer's specifications before purchase to compatibility.