PREMIUM PRODUCT: Glass test tubes are made of borosilicate glass, heat resistant, and test tube is reusable after cleaning.
VERSITILITY: They can be used to store bath salts, spices, hot chocolate, powder, as well as liquid, breeding plants. Also, transparent test tubes are good choices for breeding plants and party decorating.
FURTHER APPLICATION: glass tubes cork stopper has a good seal. The bottom of the glass test tube is flat so it can be placed upright. ROTATE the lid to ensure tightness.
