Abrasion Resistant: The AF100 trimmer spool is made of improved nylon polyamide material with a tensile strength exceeding 45kg, offering 30% greater durability compared to other brands for extended lifespan. Easy to Install: Designed to fit compatible trimmer models perfectly, the spool can be installed quickly and easily without tools. Easy to Use: The weed eater spool compatible with Black+Decker models features an automatic feed system powered by centrifugal force, reducing the need for manual line adjustment during operation. Professional Quality: Built to deliver reliable performance with high-quality materials and design. Package Includes: 12 packs of AF100 thread spool (1.65mm, 9m per piece), 3 caps, and 3 springs. Compatible with Black+Decker grass trimmer models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525SB, GL5028, GL5028SB, GLC1423L, GLC1825N, GLC1823L, GLC1825L, GLC3630L, ST5530, ST4525, STC1820, STC1815, STC1820PC/EPC, STC1840/EPC, ST1823.