Stihl mowing line CF3 Pro The CF3 Pro features a high-strength mowing line. The 3-component line is made of high-quality polyamide. This increases the service life of the mowing line. Thanks to the twisting, the whistling noise that occurs when mowing is noticeably quieter. And the new cross-shaped profile ensures better mowing performance and clean trimming edges. The high-tech mowing line is compatible with many STIHL mowing heads.