The MTD Troy Built 791-153577B 49U3577L953 Trimmer Dual Line Cartridge in 080" length is a high-quality replacement part for string trimmers and weed trimmers. Designed specifically for MTD and Troy-Bilt brand trimmers, this dual line cartridge ensures precise and efficient cutting performance. With one cartridge included in the pack, this product is perfect for maintaining your yard and garden with ease and effectiveness.