Hydrometer Test Jar, laboratory grade Borosilicate glass, for Brewers and Distillers, hexagonal base and plastic safety ring, 11" tube Hydrometer Test Jar for Distillers and Brewers Clear laboratory grade Borosilicate glass, pour spout Flat hexagonal base for stability, hexagon shape helps prevent rolling if it tips over Plastic safety ring with flat sides to prevent breakage and rolling if it tips Tube height approx. 11", total height approx. 11.75", inside diameter approx. 1.125"