This package includes 5 drum cleaning units designed for use with printer models 163, 165, 166, 167, 203, 203L, 205, 206, 207, 255, 256, 257, 280, 282, 283, 181, 237, 307, 3508A, 357, 457, and 507.These components are manufactured to meet specifications, functional compatibility and restoring standard printing function.Each unit is inspected prior to shipment to verify adherence to technical requirements.This accessory serves as a direct replacement to maintain the operational status of your device.