SPECIFICATION: autofeed replacement Line Spool for Black+ AF-100-3ZP String Trimmers. COMPATIBLE MODELS: for Black+ 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 & 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 AF-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.