LimbSaver Comfort-Tech 24010 Shaft Dampener for Shaft-Driven Power Tools, Green, (2 Pack) Reduces up to 50 percent of felt vibration during continuous use of shaft-driven power tools like weed trimmers, brush cutters and more Helps prevent stress on your body, enabling you to work harder longer Made from LimbSaver's proprietary vibration-dampening NAVCOM material For use in all harsh weather conditions; resistant to UV rays and solvents Fits all standard 1- to 1-1/4-inch shafts; includes two dampeners