String Trimmer Replacement Spools: 36ft flexible spool line, perfect replacement for model No. 513937190. At 0.060 inch in diameter, this spool can cut and chop quickly.Durable Material: The strimmer line is made of durable ABS spool and premium nylon line, which keep the spool line stable while using the grass trimmer, hard-wearing and cutting grass faster.Easy Installation: Do no additional tools are required, just remove the old spool line and replace it with a new one to complete the installation, keep your grass trimmer performing.Compatible with: This strimmer spool fits for Flymo FLY021 grass trimmer, replacement of 513937190, ease the tedious work of hand-winding spools.FLY021 Fits for the following models - Contour 500 XT, Power Trim 500 XT, Mini Trim Auto ST/XT/Plus XT, Mini Trim Contour XT, Speedi-Trim, Contour, Contour 500/700, Mini Trim Auto/Auto, Multi Trim 250D/250DX/300D/300DX, Power Trim (pnc 9648641), Power Trim 500/700 (pnc 9648596/7), Revolution 2000/2300/2500 and Twist and Edge.Colour:grey+redMaterial:ABS, nylonPackage Contents:10 x String Trimmer Spool LineOnly the above package content, other products are not included.Note: Light shooting 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.