These 1950's Petite Sized Mercury Glass Christmas Tree Balls measure 0.5" (13mm) in diameter, which makes them perfect individually for a tabletop tree or clustered for a full size tree. Mercury glass is glass that was blown double walled, then silvered between the layers with a liquid silvering solution, and sealed. The 24 balls come in seven colors (red, pink, green, pale blue, deep blue, silver and gold) and have been gathered into clusters of 6 with a green chenille pipe cleaner loop or thin cord. They are unmarked but were probably manufactured in Japan. All of these 1950s Petite Sized Mercury Glass Christmas Tree Balls are in very good condition with no wear or damage.