This is Stihl's 4004 710 2180 PolyCut 5-3 Plastic 3-Blade Trimmer Head. Maximum reliability, even in extreme conditions is a hallmark of Stihl power tools. If anything should ever go wrong with your Stihl machine, it is important to use genuine Stihl parts which give the performance, safety and longevity of your Stihl power tool.
