ABS spool and nylon cord: the edge spool is made of high quality raw material, ABS spool is sturdy enough, nylon cord, flexible, not easy to break, support fast cutting and longer service life. Compatibility: This strimmer spool fits Flymo FLY021 strimmer, replacement of 513937190, makes the tedious work of hand winding easier. COMFORT AND HIGH EFFICIENCY: Allows the cord to stretch and dampen upon impact on hard surfaces. The aerodynamic shape allows less resistance for more efficient cuts. Easy to use and install, pre-wound tool-free installation, can be removed in and out of the trimmer for easy use. Precautions: strong centrifugal force and fast cutting during use, recommend wearing eye protection and long trousers to avoid unnecessary injury. And this cordless weed remover parts refill is only suitable for delicate weed grass. Strong weeds are recommended to trim blades. Size: cordless grass trimmer spool line diameter 0.2 cm fits perfectly line hole spool line length 11.0 m offers a wider range of mowing work. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin