What a nice set! This is a 1940's 5 piece travel cocktail shaker companion solid copper shot glass set. The set is in excellent to near Mint condition for it's age, about 75 years old.  All of the shot glasses perfectly nest inside of each other. Each shot glass measures 1 3/8" wide x 1 5/8" tall. They are marked SOLID COPPER on the bottoms. The insides are super clean! This is the nicest, cleanest solid copper shot glass set I have ever owned. They look like they were hardly used. Straight out of my collection. You will not find a nicer set this this one. What a nice set to add to any collection. Thanks, and enjoy!