FITS MODELS - Compatible with string trimmer models: CST500, CST800, GE600, ST1000, ST200, ST300, ST3000, ST400, ST4000, ST4400, ST4500, ST5000, ST6500, ST6800. Spool model: -136 / -136-BKP / 143684-01. Cap model: 682378-02. SPOOL SPECIFICATION - 20ft 0.065 inches string trimmer replacement spool compatible with original spools models -136 / -136-BKP / 143684-01. Length 20 foot trimmer provides a wider range of mowing area. 0.065 inches diameter wearable supports fast cutting and lifetime. DURABLE MATERIAL - Premium ABS automatic bump feed spool & durable polyamide nylon string trimmer/edger replacement , pliable and flexible and long service life. Use centrifugal force and aerodynamics to reduce drag and achieve fast cutting string -free. CONVENIENT&TIME-SAVING - Snap into place for quick and effortless replace without tools. Professional machine cutting and automatic winding is more time-saving than manual winding, reduces damage for string grass trimmer and not stuck when mowing. PRECAUTIONS FOR USE - Wear goggles and long pants when using this product to avoid injury from spilling lines. Unplug tool changing, installing, or removing accessories. This cordless parts refill is only suitable for young grasses. Strong weeds use other tools. size:20 feet long, 0.065inch diameter Material:ABS, nylon colour:Black Package Contents: 1 x String Trimmer Spool 1 x Cap Cover 1 x Spring Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.