[Premium Material]: Replacement string trimmer spool line is made of high quality nylon material. Not easy to break supports fast cutting and longer lifetime.[Convenience High Efficiency]: Pliable and strong cord Compatible With trimming. Allowing Compatible With the line to stretch and cushion on impact with hard surfaces, the aerodynamic shape allows less drag Compatible With more efficient cuts.[Auto Feed System Replacement Spool]: Compatible with Compatible With Ryobi string trimmer and utilizes centrifugal Compatible Withce to feed the trimmer line as it is needed. With auto-feed system replacement spool eases the tedious work of hand-winding spools.Premium trimmer line: The 11ft trimmer line allows Compatible With a larger mowing area. The durable and flexible polyamide nylon thread has a diameter of 0.065inch. It is extremely durable Compatible With continuous work.Note: not including othersColour: black + blueMaterial: nylonPackage Contents:4 * Replacement trimmer spoolsOnly 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.