Niagara Falls Shot Glasses. Vintage Souvenir Four Piece Multi Colored Set. Flared Glass in Metal Holders. Each Unit is about 2 1/2 inches tall and about 1 1/2  inches in diameter at rim. Unknown Metal, but gold colored. The Bottom of one Glass shows Made in Japan and the number 10, the other three just show the number 10. Please see picture close-ups.