bobbins models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525SB, GL5028, GL5028SB,GLC1423L, GLC1825252525255525. N, GLC18 23L, GLC1825L, GLC3630L, ST5530, ST4525, STC1820, STC1815, STC1820PC/EPC, STC1840/EPC, ST1823 Automatic feed coil: Eventronic Spool for Black and Decker Weed Eater is easy to use, automatically feeds the trimmer through centrifugal force reducing the tedious manual sorting of the trimmer line spool while working. Abrasion resistant: The Eventronic trimmer line for Black+Decker weed killer is made from an improved nylon polyamide material that has a tensile strength of over 100 lb and is 30% more durable than other brands for a longer service life. Efficient cutting: Eventronic Strimmer Spool Thread for Black&Decker Weedepers is p and flexible, allowing the thread to stretch and cushion on impact on hard surfaces and increase cutting efficiency by 50%, allowing each spool to cut more weeds.