Material: ABS spool and durable nylon thread, flexible and long service life; This kind of material can reduce drag and achieve fast cutting. Save Working Time - easy to use and install, pre-wound, tool-less installation, in and out of trimmer for ease of use. Long lasting, saves you time and energy. User Precautions: Strong centrifugal force and cutting fast during use, recommend wearing eye protection and long pants to avoid unnecessary injury. This cordless weed eater parts refill is only suitable for tender weed grass. Strong weeds are recommended to be trimmed using blades. Spool line is 27 ft / 8 m in length and 0.0629 inch / 1.6mm in diameter. Color: Black. Material: ABS, Nylon. Package Contents: 1 x replacement spools, 1 x trimmer replacement spool cap covers. Only 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 to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.