COMPATIBLE WITH:Compatible with for HT-19-401-003-06,& HT-19-401-003-07,Compatible with 20V Max String Trimmers MATERIALS:Made of high quality ABS and nylon material,it"s sturdy and flexible,not easy to break when used.It has been factory tested repeatedly to durability and stability. EASY TO INSTALL:Auto-feed system replacement spool eases the tedious work of hand-winding.You can install and remove quickly just by hands, no need other tools. Colour:Black+Red Material:ABS+nylon Package Contents: 8x replacement trimmer line spool 2x replacement spool cap Only the above package content, other products are not included. Note: Light reflection 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.