Square planter material: This black metal tall planter is made of thickened galvanized steel, with 3 layers of high temperature baking paint to prevent rust and fade. The outdoor planters surface is smooth, corrosion resistant and oxidation resistant. The metal material makes the large planters hard, firm and wear-resistant, and can withstand any weather test. Tall planter size: The black square planter height is 28 inches, length is 13.8 inches, width is 13.8 inches. The black plant pot is equipped with 24 screws, a wrench, protective gloves and instructions. Note: This 28 inches large metal outdoor flower pots needs to be assembled.