The Aero-Flex trimmer head kit can be used to convert gas trimmers to a line blade trimmer. It features easy loading nylon Aero-Flex line blades that are durable, aerodynamic, and capable of cutting through heavy vegetation. The low RPM provides efficient operation, making trimming a more pleasant experience. It is compatible with most string trimmers in the marketplace. Includes 8 line blades and hardware. No hassle design for quick and easy loading Nylon line blades feature a flexible impact hinge for reliable durability Low RPM provides efficient operation, making trimming a more pleasant experience Cuts through heavy vegetation to create a clean cut and neat edge along driveways and sidewalks Precision trimming quality reduces grass browning. Aerodynamic design reduces excessive noise and vibration. Compatible with most string trimmers in the marketplace UPC 084931841987 ASIN B00KY6SGNS Color Model 49MAUTKP703 Brand Name Aero-Flex Item Weight 13.6 ounces Manufacturer MTD Products Model Number 49MAUTKP703 Power Source Manual Item Type Name Head Kit Required Assembly No Manufacturer Part Number 49MAUTKP703