This product is a vintage antique lamp shade made of ribbed glass with a prismatic holophane design. It was patented in 1916 and manufactured in the United States during the time period of 1920-1949. It is in wonderful condition. No chips or cracks! The shade is bell-shaped, 9 inches in diameter at the wide end, 2 inches at smaller end, and 6 inches in height. It serves as light diffuser and weighs 2.10 pounds. It is an original piece, not a licensed reproduction. This lamp shade is a unique piece of art that would add a touch of Victorian style to any room.