Each spool in this 3-pack of BLACK+DECKER Replacement Spools for Grass Hog String Trimmers contains 30 ft. of 0.065 in. line to help keep your string trimmer operational. The spools are factory wound for reliability. Each spool is weatherable and features a durable construction for a long-lasting use. Fits models GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, ST8600, CST1000, CST1200, CST2000, MTC220, MTE912, LST522, LSTE523, LSTE525, NST2018, NST1118, NST2118, LST140C, LST220, LST300, LST400, LST420, LST136, LST136W.