Compatibility: Suitable for AFS 23 to 37 brushcutters. Nylon Line: The replacement spool is made of high quality raw material, the nylon line is flexible enough not to break easily, supporting fast cutting and longer service life. Efficient Cutting: Allows lines to stretch and cushion impacts on hard surfaces, and the aerodynamic shape reduces drag for more efficient cuts. Proper Size: The cordless lawn mower spool measures 3.5mm in diameter and fits perfectly into the cord hole, providing a wider cut. The square helical structure has better flexibility and durability. What You Will Receive: Package includes F016800431 50pcs black square wire, each 37cm long and 3.5mm in diameter, choose enough quantity according to your needs.