•One-button steam valve is specially made for microwave heating. Safer to release the air before use. • Rotated lock structure which is locked firmly and tightly makes it easy for one-handed use. •Food grade silicone gasket. Well sealed without leakage. Safe for outdoor use. • Three sizes available for microwave heating of various foods. • Heat resistant handle •Simple structure and lightweight design makes it more convenient for takeout and easier to clean. • Eco-friendly PP material & Free of BPA. Cold and heat resistant.