In this package you will get 8 Trimmer Lines+2 Spool Caps. Material: nylon, plastic, Spool size: 41 * 18mm, lid size: 56.5 * 31.5mm. Nylon rope specification: medium 1.65mm burgundy screw, spool: 10FT/3.05M Compatible with Multiple WORX String Trimmer Models - WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180, WG163E.9, WG163E.6, WG163E.3, WG163E.2, WG163E.1, WG163E. The unique shape of the trimmer spools reduces drag, allowing for more efficient cuts and a smoother trimming experience.Like sharp scissors, the weed is cut with ease. This will be your right-hand man to clean up your lawn. Adding just the right proportion of glass fiber to the nylon material not only dramatically increases the stiffness of the spools and caps, but also enhances wear and heat resistance, effectively extending their life. This is a feature not found in other ABS plastic spools and caps.