The Shakespeare Ballistic Hybrid Trimmer Head replacement has a unique 2-in-1 design that features line for cutting grass and blades for cutting light brush. With its quick line changes and Push and Load Technology for the blades, you can be cutting grass and then switch to blades to cut light brush in seconds. It features a patented pivoting technology so the line pivots to prevent line breakage when trimming against hard surfaces such as chain-link fence, trees and concrete, saving you the downtime of reloading line. The Ballistic Hybrid works with most gas curved-shaft and straight-shaft trimmers. Quick and easy line and blade loads. Cuts with 6 pivoting lines. Includes (6) .095 in. cut-to-length line strips, 3 nylon blades, and an adapter kit for easy installation.