●Material : ①aluminum alloy frame, electrostatic powder coating process for surface, corrosion-resistant, . ②anti_UV PC board(10 years will not fade in color) ③stainless steel parts ●Color : ①white ivory frame + blue high strength PC board ②Brown frame + brown PC high strength top PC board ●quality commitment: this products can safely be withstand 20 years, with a 1 year warranty