Compatible with most models of Black and Decker trimmers: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118, LST220, LST300, LST400, LST420, LST136 30ft / 0.065 "" Premium Replacement Line: 30ft replacement line is factory coiled for superior power Bendable and flexible allowing the line to stretch and cushion on impact with hard surfaces Package included: 6 Pack 30ft 0.065 "" Spare cutting spool Any doubts and questions, do not hesitate to contact us Product Features: Foldable and flexible allowing the line to stretch and cushion on impact with hard surfaces. The aerodynamic shape allows less drag for more efficient cuts. Perfect replacement spool for Black + Decker trimmers. Easy to install and saves you the hassle of buying a new mower.