I. Made out of Aluminized Dual Mirror Fibre Glass Aluminized Kevlar Fabric. II. Fitted with the Neotherm Furnace Observation Glass (Cobalt blue). III. "Neotherm" is available in shades 4-7A1 DIN - 7A1 DIN. IV. Available in size: 50mm Diameter, 110mm X 60mm rectangular.