Made from Borosilicate 3.3 glass with handle.
2x sizes available, 250ml and 500ml.
Microwave and dishwasher safe.
(Excerpt from Wikipedia: …” Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (˜3 × 10-6 K-1 at 20 °C), making them more resistant to thermal shock than any other common glass. “… )