This Fiberglass Serenity Pergola comes w/ Non-Tapered Square Columns,Painted White and ships with all connectors and hardware for easy installation and all hardware is Stainless Steel. Sizes are the Overall  Overhead Dimension 12'x12',14'x14',16'x16' w/a 4' inset for Columns. This item comes standard and no changes can be made to this model.

12'x12' has 8"x8' Square Columns

14'x14' has 10"x8' Square Columns

16'x16' has 10"x8' Square Columns