Compatibility: suitable for AFS 23-37/AFS 23-38 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 trimming and longer service life. Efficient Cutting: Allows lines to stretch and cushion impact on hard surfaces, and the aerodynamic shape reduces drag for more efficient cuts. Appropriate Size: The cordless lawn mower spool is 3.5mm in diameter and fits snugly in the cord hole, providing a cut. The square helical structure has better flexibility and durability. Model Number:F016800431 color:Silver black Material:Metal + Plastic size:Length about: 37cm Package Contents: 20 x F016800431 Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.