Caution, you are about to enter a crime scene with unidentified liquids. Be careful of what you ingest with the PSI Test Tube Shot Glasses. These shot glasses are just what you need for a CSI theme party. Each PSI Test Tube Shot Glass holds approximately 2 ounces, so you can fill it as much as you like with your party poisons. This inexpensive party favor has flat bottoms. Please Note: The PSI Test Tube Shot Glasses are not compatible with the Test Tube Rack. Product Features Material: clear plastic w/ PSI in black lettering Measures: 6 3/4 inches tall Holds two (2) ounces Flat bottom Six (6) shot glasses per package