Compatibility: Fits AFS 23-37/AFS 23-38 Brush Cutter. Nylon: The replacement spool is made of high-quality raw materials, the nylon is flexible enough not to break easily, allowing for a longer cutting and service life. Efficient Cutting: Allows lines to stretch and cushion impact on hard surfaces, and the aerodynamic shape reduces drag for more efficient cuts. Proper Size: The lawn mower spool without measuring 3.5 mm in diameter and fits perfectly into the cord hole, providing a wider cut. Square helical structure has better flexibility and durability. Model Number: F016800431 Color: Silver Black Material: Metal + Plastic Size: Length about: 37cm Package Contents: 100 x F016800431 Line Cutter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.