Spool Specification: Compatible with for Black & Decker string trimmer spools, 20ft 0.065 inches, compatible with original spools models -136 / -136-BKP / 143684-01.Compatible models: Fit for Black & Decker weed eater string trimmer: ST1000, ST3000, ST4000, ST4050, ST4500, ST5000, GE600, ST200, ST300, ST400, CST800, ST6800.Professional CNC winding spool: Compatible with for Black Decker spools by the CNC machine cutting and winding, automatic line change. Manual winding is cumbersome and can easily get stuck during use, which can cause damage to the string trimmer.Rugged: High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. Use centrifugal force and aerodynamics to reduce drag and achieve fast cutting.Precautions for use: When you using this product, protective measures should be taken to avoid damage to the body caused by spilled wires.colour: blackMaterial: ABS, NylonPackage Contents:3 x String Trimmer Spool LineOnly 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.