Features: Made of high-quality material, durable and sturdy, resistant to scratches and corrosion. Easy to install, no tools required. Simply snap into place with the spool line, convenient to use. Protects your fishing line and keeps it in place on your fishing line trimmer. Technical data: Color: as shown Material: plastic Size: 4m, 1.6mm Included: 3 pcs x line for grass trimmer How to replace the thread spool: - Remove the battery from the device - Open the drum by pressing two release buttons on the drum at the same time - Remove the drum cover and remove the bobbin - Push the ends of the thread of the new thread spool out of the holes in the trimmer spool - Insert the new bobbin into the drum so that the arrows indicating the direction of travel are visible on the bobbin after inserting it - Then put both ends of the thread through the opposite eyelets - Put the cover back on the drum - Pull the ends of the thread and press the locking button several times until both ends protrude approximately 1 cm past the thread cutter. Real photos shared by our customers