Fits string trimmer models: CMCST900, CMCST910 CMESTA900, CMESTE920 & CMCST98020 series string trimmers. Fits model: Our string trimmer replacement spools are compatible with for CRAFTSMAN-CMZST065 & CMZST0653. Cap cover model: CMZST120SC.String trimmer line: Premium about 30ft in length and 0.065inch in diameter. String Trimmer Spool Line easily cuts through grass and weeds. Llows less drag for more efficient cuts. Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces.Auto feed grass trimmer spool line: High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. The trimmer replacement spool utilizes centrifugal force and aerodynamics to reduce drag, Achieve fast cutting and utilizes centrifugal force to feed the trimmer line as it is needed. The auto feed system replacement spool eases the tedious work of hand-winding spools.Pre-wound, ready to go: Each replacement spool comes pre-wound and may be replaced easily in a few seconds. It is very easy to assemble and remove, you can snap it into the right place and then assemble them quickly and easily just by hands, no need other tools.Precautions for use: Wear safety goggles and long pants when using this product to avoid injury from spilling lines. This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim.Colour:As shownMaterial:ABS, nylonPackage Contents:10 * String Trimmer Spool Line2 * Spool Cap Cover2 * Spool SpringOnly the above package content, other products are not included.Note: Light 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.