About this item:
3 RUBBER STOPPERS INCLUDED: This set has 3 rubber stoppers for these 3 Erlenmeyer Flasks, which are sterile & can seal the liquid in the flasks perfectly for an experiment. 
ACCURATE SCALES: 3 Erlenmeyer Flasks in different sizes (250ml 150ml 50ml) have clear and accurate scales for you to measure liquid efficiently & accurately without any problem. 
SIGNIFICANT FEATURES: Reusable, environmentally friendly, will not shatter easily, easy to clean, high-temperature resistance, for laboratory, chemistry, science experiment, liquid measuring, etc. 
HIGH-END MATERIAL FOR LAB: These Borosilicate Glass Erlenmeyer Flasks have High chemical durability and low thermal expansion, which can withstand temperatures under 800 °C (~1500 °F).