Low Form Dewar Flasks are made by the introduction of advanced U.S.technology and high-vacuum equipment,Heat insulation in the low temperature heat reaction.Intermediate vacuum exceeds 10-5mmHg,to ensure the insulation effect. ● Meterial:Silvered glass inner ● Color:White ● Aluminous shell,does not affect the magnetic stirring ● Magnetic stirring has a chose distance from the bottom,so you can through the flask to do Magnetic stirring ● Flask size shown is the maximum capacity flask that will fit inside the dewar