Replacement bobbin models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525SB, GL5028, GL5028SB, GLC1428SB, GLC1428SB, GLC1428SB, GLC1428SB, GLC1428SB. 3L, GLC11 825N, GLC1823L, GLC1825L, GLC3630L, ST5530, ST4525, STC1820, STC1815, STC1820PC/EPC, STC1840/EPC, ST1823 Automatic Feed Coil: Eventronic replacement coil for Black and Decker Weed Eater is easy to use, automatically feeds the trimmer by centrifugal force thus reducing the tedious manual sorting of the replacement trimmer line coil while working. Abrasion resistant: the Eventronic trimmer line for Black+Decker weed killer is made of 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 Trimmer Spool Thread for Black&Decker Weeders is pliable 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.