This round storage jar made by high barosilicate glass, high borosilicate glass has good fire resistance and high physical strength, compared with ordinary glass, it has no toxic side effects and can be used for microwave heating. High borosilicate heat-resistant glass material, resistant to sudden changes in high and low temperature, to meet your life needs.
https://www.xingnuoglass.com/glass-canister/round-glass-storage-jar/round-storage-jar-with-bamboo-lids.html