Dual-function valve can be opened to release steam automatically or closed to seal in moisture. High heat resistant silicone and tempered glass forms a tight seal that fit on pots and pans from 22-28 cm. Prevents boil overs when cooking foods like rice, beans, soups, etc. Glass lid and vent control on handle allowing for easy handling. Dishwasher safe and glass lid allows you to check your cooking easily, not as heavy as an all-glass lid to use as regular lid. Expand your cookware versatility with ARSHIA Smart Lid.