Glass construction. On holding the lower bulb in hand causes the liquid inside to biol and shoot into the top bulb. The body heat causes the liquid to appear as if boiling. Any excess amount of pressure on the product can cause it to shatter or break. Use extreme caution. DO NOT IN ANY CASE HEAT THIS PRODUCT, IT WILL CAUSE IT TO EXPLODE. The liquid inside is extremely volatile and inflammable.
All glass strong Hex base Cylinders for added stability. Double graduations to pour and contain.