Hot-dip galvanized (steel) and untreated pine., Powder-coated, hot-dip galvanized (steel) and oil-treated pine., Hot-dip galvanized (steel) and oil-treated mahogany (wood)., Powder-coated, hot-dip galvanized (steel) and oil-treated mahogany (wood)., Hot-dip galvanized (steel) and untreated mahogany (wood)., Powder-coasted, hot-dip galvanized (steel) and untreated mahogany (wood).