String Trimmer Replacement Spools: 11m spool line, compatible with original spools models FLY021 and 513937190. cord diameter 1.5 mm, can cut and chop quickly. Compatible with: Suits various Flymo grass trimmers. 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. Durable Material: The strimmer line is made of durable ABS spool and premium nylon line, hard-wearing and cutting grass faster. Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces. Double Autofeed Spool: ease the tedious work of hand-winding spools. Easy to install, just remove the old spool line and replace it with a new one to complete the installation. Specifications: Material: High quality nylon. color: as show Size: 11m long, 1.5mm cord diameter Cap material: ABS Spool cap cover model: 513937190 Compatible with Flymo FLY021 Trimmer/edger's