Compatible with Flymo Contour, Contour XT, Contour 500 XT, Contour 500E, Contour 700, Power Trim (PNC 9648641), Power Trim 500 XT, Power Trim 500/700 (PNC 9648596/7), Mini Trim, Mini Trim Auto ST/XT, Mini Trim Plus XT, Mini Trim Contour XT, Auto XT, Auto Mini Trim, Auto Plus, Speedi-Trim, Multi Trim 250D, Multi Trim 250DX, Multi Trim 300D, Multi Trim 300DX, Revolution 2000, Revolution 2300, Revolution 2500, Twist 'n' Edge. Replacement spool for string trimmer is designed to be compatible with Flymo lawn mowers. Features an autofeed system that uses centrifugal force to release trimmer line as needed, reducing the need for manual rewinding. Made from high-quality ABS material, the durable nylon spool easily cuts through grass and weeds. The spool is resistant to breakage, supports efficient cutting performance, and absorbs impact from hard surfaces. Its aerodynamic design enhances cutting efficiency and reduces drag. Product numbers: FLY021, 513937190. Please verify compatibility with your trimmer model before purchase. Packaging includes 4 replacement spools (model FLY021/513937190). Spool specifications: 11 m (36 ft) of 1.5 mm (0.06 inch) diameter trimmer line.