FITS MODELS - with string trimmer models: CST500, CST800, GE600, ST1000, ST200, ST300, ST3000, ST400, ST4000, ST4400, ST4500, ST5000, ST6500, ST6800. Spool : -136 / -136-BKP / 143684-01. Cap : 682378-02.SPOOL SPECIFICATION - 20ft 0.065 inches line string trimmer replacement spool with original spools models -136 / -136-BKP / 143684-01. Length 20 foot trimmer line provides a wider range of mowing area. 0.065 inches diameter wearable line supports fast cutting and lifetime.DURABLE MATERIAL - Premium ABS automatic bump feed spool & durable polyamide nylon string trimmer/edger replacement line, pliable and flexible and long service life. 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 . Professional machine cutting and automatic winding is more time-saving than manual winding, reduces damage for string grass trimmer and not get stuck when mowing.PRECAUTIONS FOR - Wear goggles and long pants when using this product to avoid injury from spilling lines. Unplug tool before changing, installing, or removing accessories. This cordless parts refill is only suitable for young grasses. Strong weeds other .size:20 feet long, 0.065inch diameterMaterial:ABS, nyloncolour:BlackPackage Contents:1 x String Trimmer Spool Line1 x Cap Cover1 x Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.