10pcs GPR 34 35 42 43 / NPG 50 51 56 57 / C-EXV 32 33 38 39 OPC Drum for iR 2520 2525 2530 2535 2545 4025 4035 4045 4051 The OPC (Organic Photoconductor) drum is a key component in laser printers and photocopiers, responsible for transferring toner onto paper during the printing process.It features a light-sensitive coating that reacts to the printer's laser beam, creating an electrostatic image that attracts toner particles.This toner is then transferred to paper and fused with heat and pressure to produce the final print.With regular use, the of the OPC drum can degrade, leading to print quality issues such as streaks, lines, faded text, or toner smearing.A worn drum may also contribute to paper jams or irregular printer behavior.Replacing the OPC drum at appropriate intervals helps maintain consistent output and supports printer.This 10-piece OPC drum set is designed for compatibility with iR 2520, 2525, 2530, 2535, 2545, 4025, 4035, 4045, and 4051 models.It includes drums matching the GPR 34, 35, 42, 43, NPG 50, 51, 56, 57, and C-EXV 32, 33, 38, 39 specifications, making it suitable for users managing multiple devices or requiring bulk replacements.Each drum is constructed to support stable performance and consistent print results.The design allows for straightforward installation without the need for special tools.Regular replacement of the OPC drum can help sustain print clarity and support the overall longevity of the printer.Signs that indicate a drum may need replacement include visible defects in print output, repeated toner adhesion issues, or unusual operational behavior.Installing a replacement drum involves powering down the printer, accessing the drum unit, removing the old component, inserting the drum securely, and restarting the device.Some models may require resetting the drum counter through the printer menu.This pack provides a practical solution for ongoing maintenance, offering multiple units for extended use across compatible systems.