Qauick Gear Box Head/Gearbox Head Pully Fits for Stihl String Trimmer Brush Cutter Fs120 Fs200 Fs250 Qauick GearBox Head Fits Stihl Chainsaw Stihl FS120 FS200 FS250 BRUSH Cutter Parts 4137 640 0100 Stihl Trimmer FS120 / FS200 / FS250 / FS120R / FS200R / FS250R Replace part numbers: 4137 640 0100 Pls check your correct replacement parts before purchase, the picture show more detail, thank you. Package Include: item as pictured