Suitable for Ryobi One+: Designed for Ryobi One+ cordless trimmers. Compatible with most Ryobi trimmers, including 18V, 24V, and 40V models. High-quality trimmer line: The 3.35 m long trimmer line with a diameter of 1.6 mm provides a wider cutting area. The durable and flexible nylon-polyamide line does not break easily, ensuring continuous operation. Fast and clean cuts: The automatic feed system replacement spool eliminates the tedious work of manually winding the spools. It uses centrifugal force and aerodynamics to reduce air resistance and achieve fast, clean cuts. Perfect replacement spool: These spools are a perfect replacement for most original Ryobi spool models, such as RAC125 and AC14RL3A. The spool can be inserted and removed without tools, making operation easy. Damage to the device is avoided and the thread is used optimally. Affordable set: The package includes 6 replacement spools and 2 spare caps.