Suitable for Multiple String Trimmer Models: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, 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 [Cuts Fast and Wearable]Premium -100 0.065-inch/1.65mm diameter wearable , and includes six high-quality spool trimmers for a better replacement and continuous operation. [Saving Effort]Automatically feed the cutting rope with centrifugal force, so that you are not so tired during mowing. [6+1+1 Accessories]Package contained 6 packs 30-foot trimmer ; 1 pack replacement spool cap cover; 1 pack spring. [Auto Feed System Replacement]It designed for string trimmer. With Auto Feed System Replacement Spool eases the work of hand-winding spools. Material: plastic colour: As shown Package Contents: 6 x coil 1 x Lid 1 x spring Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.