and high quality Features: Adaptable Models: Compatible with 3520, 3540, WF3520, WF7010, WF40, WF600, WF7520, F190020, 7521, 7525 Series Printers. Material: Made of plastic and metal, durable and practical. Replacement Parts: Can be used to replace old or damaged print heads. Occasion: Easy to install, suitable for home, office, and other environments. High Performance: Offers stable performance and high reliability. Specifications: Material: Plastic, Metal Color: Black Print Color: Colorful Note: 1. Always turn off the printer power before installation to avoid damaging internal components. After installing the print head, print 10 pages of A4 documents without the ribbon to allow the new print head to properly break in, then install the ribbon. Handle with care during operation. 2. If the original print head was damaged or had ink leakage, the mainboard may also be affected. Inspect the mainboard before replacing the print head. The F1 and F2 fuses on the mainboard must only be replaced with original fuses of the same current rating and model. Using fuses with a higher current rating or different model may damage both the print head and mainboard. 3. Print heads require careful handling. Improper installation by non-professionals may result in damage. Print heads are delicate and not covered under warranty. Avoid testing or adjusting on the machine; handle with caution. 4. If you are not experienced with printer maintenance, it is recommended to take the printer to a professional repair service for print head replacement to prevent damage and ensure proper function. Package Includes: 1 x Print Head