Compatible with multiple models of Black+Decker weed wacker, including the GH series, ST series, CST series, MTE series, NST series, LST series, and more. Please refer to our model images for details. The centrifugal force automatic feeding and trimming machine reduces the hassle of manually sorting and changing the trimming line spools during the work process. This set includes 12 replacement trimmer line spool and 4 spool cap cover Bessport trimmer line is made of upgraded nylon polyamide material, with a tensile strength of over 100 pounds, offering 30% greater durability than other brands and a longer lifespan. If there are any problems with our product, please get in touch with us. We will strive to offer you a satisfactory solution. Bessport 8 Pcs AF-100 String Trimmer Replacement Spool Fit for Black+Decker, 30ft 0.065" Trimmer Line Autofeed Weed Eater String Compatible with Black+Decker Weed Wacker (12 Spool+4 Caps)