A trimmer line for use with a trimmer head of a rotary trimmer is provided, wherein the trimmer line comprises two substantially equal lengths of line connected to each other by one of their ends to form the trimmer line, the two substantially equal lengths of line being of different colors to indicate the middle of the trimmer line. Such a trimmer line allows to easier, or more at least more accurate, spooling of the trimmer line on a trimmer head.