SPECIFICATION: autofeed replacement Line Spool for -100-3ZP String Trimmers. COMPATIBLE MODELS: for GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, CST1200, CST2000, MTC220, MTE912, NST1018, NST1024, NST1118, NST1810, NST2018, NST2118, LST120, LST136, LST140, LST201, LST220, LST300, LST400, LST420, LST522, LST1018, LSTE523, LSTE525, BESTA510, BESTA512, BESTE620. CONVENIENT: Tool-less installment, pops in and out of trimmer for ease of use. Use centrifugal force and aerodynamics to reduce drag and achieve fast cutting. FLEXIBLE & DURABLR MATERIALS: High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. EASY TO OPERATE: Auto feed system replacement spool help to ease the tedious work of hand-winding spools. Size: 30ft length, 0.065 inch diameter Material:ABS, nylon colour:Black + White Package Contents: 4 x -100-3ZP replacement trimmer spools Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.