Premium Quality The strimmer replacement cord is made of premium raw material, ABS spool is sturdy enough, flexible nylon rope, strong enough for a long service life. GOOD GARDENING HELPER - Premium 36ft and 1/8 inch double automatic feeding spool and wire provides a wider range of cutting space, which can easily cut grass and weeds, the replacement spool of the automatic feeding system makes the tedious work of manual winding coils easier. Compatible with: The dual line strimmer spool can be compatible with different Fly-mo strimmers. Part Number: FLY021 and 513937190 What You Get:We provide 3 combination of items: set 1:4 bobbins of double line thread; or set 2:6 bobbins of double line thread; or set 3:10 bobbins of double line yarn. You can choose the quantity you want according to your needs. Reliable After-Sales - Less line breaks, provides greater flexibility and strength. If you have any questions after receiving the package, you can tell us, our professional customer service team will help you solve it within 24 hours, please don't worry.