Material: ABS spool and durable nylon thread, flexible and long service life; These kind of material can reduce drag and achieve fast cuttingSave Working Time-easy to use and install pre-wound Tool-less installment, in and out of trimmer for ease of use,long lasting saves you time and energyUser Precautions: Strong centrifugal force and cutting fast during using, recommend to wear eye protection and long pants to avoid unnecessary injury. And this cordless parts refill is only suitable for tender weed grass. Strong weeds will been recommended to use blades to trim.spool line is 27 ft/ 8. in length and 0.0629 inch/ 1.6mm in diameterColor: BlackMaterial: ABS, NylonPackage Contents:1 x replacement spools1 x trimmer replacement spool cap coversOnly the above package content, other products are not included.Note: Light reflection 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.