Aluminum Buildings have clear anodized construction.
Press Release Summary:

Original Press Release:
Pre-Assembled Aluminum Buildings Available From Porta-King
Porta-King's no-rust, non-weld aluminum buildings are a durable and inexpensive option whenever a pre-assembled building is needed.
The Duraluminum® clear anodized aluminum construction virtually eliminates oxidation and surface deterioration, while the non-weld design means quick assembly and easy component replacement as desired.
Porta-King's anodized aluminum buildings are shipped pre-assembled and pre-wired for convenient installation, and are backed by a five-year warranty on all wall panel construction and finish.
Many options are available, including tinted and bullet-resistant glass, security screens, transaction windows, and climate control equipment.