has a thickness of about 0 05 to 0 06 inches with downwardly projecting dimples 213 215 etc evenly distributed across the central body portion 240 on about 1 0 inch centers each dimple may have a height of about 0 1 inch and a radius of about 0 25 inch the top sheet 212 in one embodiment comprises a single honeycomb layer of paper material covered by top and bottom layers of paper material which are adhered to the honeycomb layer in the same manner as described above with respect to honeycomb layer 118 top and bottom layers 117 and 119 and glue layers 125 127 in one embodiment the cell size of the honeycomb layer is u00bd inch i e u00bd inch between opposite side walls the honeycomb may be constructed from craft paper such as 26 lb to 32 lb mullen verse paper having a cell wall thickness of 0 01 inches the top and bottom layer paper may be the same as the cell wall paper or slightly thicker e g 10 thicker then the cell wall paper in one embodiment in which the cell height is u00bd inch the stiffness per surface area of the top layer may be approximately 94 447 lbs inch sq inch in an embodiment in which the cell height is 1 inch the stiffness per surface area may be approximately 47 223 lbs inch sq inch in an embodiment in which the cell height is 2 inches the stiffness per surface area is approximately 23 611 lbs inch sq inch in another embodiment in which the cell size is u215c inch i e u215c inch between side wall faces of the cell and in which the.