@Override
    public String toString() {
        return "MarkerLabel [text=" + text + ", className=" + className + ", color=" + color + ", fontFamily=" + fontFamily + ", fontSize=" + fontSize
                    + ", fontWeight=" + fontWeight + "]";
    }
The font weight of the label text (equivalent to the CSS font-weight property).
primefaces/src/main/java/org/primefaces/model/map/MarkerLabel.java