The company's Copper doors feature Series II insulation, glossy black powder, coated hardware, and a 99.9 percent copper finish. In addition to adding aesthetic appeal, copper is practical because it won't rust. Each door is furnished with the company's Finger Shield system, which is designed to prevent accidental pinching or crushing of fingers. The doors are available in five styles and sizes up to 24-feet wide by 20-feet high. Martin Door Manufacturing. 800-388-9310.