If you're tired of messing with trimmer line, this simple and convenient Spools is the solution for your trimmer. Simply remove the old spool, replace it with one of the new pre-wound spools and you're ready to get back to work. Pliable and flexible, it allows for the line to stretch and cushion on impact with hard surfaces. Feature - Color: As shown. - Material: Nylon. - Size: Approx. 5.5x2.1x2.1cm - Easy to use and install, and save you time and energy. - Pliable and flexible, it allows for the line to stretch and cushion on impact with hard surfaces. - Choice of landscaping professionals. - Auto Feed System replacement spool eliminates time spent hand-winding string trimmers. - Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand