Vitreous Enamel is a glass surface fused to a steel substrate at very high temperatures - over 800°C. The process is referred to as wet enamelling and must be done by hand and is the most skillful type of enamelling. Multiple applications and firings build a thick glass surface with depth of color. Material: Vitreous enamelled steel shade. Vitreous enamel finishes are VOC-free, durable, fade-proof, steam and corrosion resistant. Brass socket. Ø:8.9" x H:5.9" Weight: 1.1 lbs Made in: United Kingdom 1933 Max Wattage: 60 Fixture: E26 Environment: Indoor