These test tube shot glasses are made out of borosilicate glass, just like a real test tube. Each one measures 22mm x 160mm, and has a capacity of approximately 2 ounces. Featuring a black radiation symbol that has been fixed to the glass, it is perfect as a replacement for broken shooters. Unlike a traditional test tube where the rim is only slightly flared, these shot glasses feature an exaggerated flared rim, making it easier to tip it back and drink the contents. Pair them with a test tube rack to make your event even more lab-themed. These test tube shooters make a great conversation starter for any science enthusiast.