Specifications include, but are not limited to: 1) Bottom tubing shall be of smooth, heavy walled steel to keep the units from freezing to the ground or sinking in soft mud. Base piping shall be a minimum of 7” x 5” x ¼” rectangular steel tubing. 2) Rugged steel construction with full welds and tough enamel finish to protect the units. 3) Net supports shall be made of thick walled steel that is primed and provides a strong support as follows: a. Net supports shall be a minimum of 4” x 2” rectangular tubing; b. Front supports shall be a minimum of 4” x 4” square tubing, reinforced on the front for additional wear surface. 4) Each unit shall be equipped with a top canopy to stop litter from escaping over the fencing.