Abstract: The present invention relates to a fabrication of rectangular shape string-thick-plate and square columnar string-thick-plate pack fabricated by joining a multiplicity of string-thick-plates for use as fill media in cooling towers. The string-thick-plate consists of two vertical-string-screens, on both sides of plate, fabricated by winding one long string over semicircular holes on the top and bottom frames of the string-thick-plate. Intervals between adjacent strings of the vertical-string-screens are designed to preserve a maximum optimized surface area of the strings being able to obtain a maximum cooling efficiency of the string-thick-plate pack. The string-thick-plates are designed to be assembled into upright and tilted string-thick-plate packs, which are installed uprightly and slantly in cross- and counter-current cooling towers, respectively. The string-thick-plates of the present invention tremendously reduce the fabrication cost of a large square columnar string fill pack in one structure.