1、304 stainless steel, rust‑proof and durable. Buckle + silicone ring, strong seals, anti‑corrosion, anti‑acid, reliable to use.2、With a one‑way exhaust valve on the lid, automatically discharge the carbon dioxide produced by the coffee beans in the tank. Also isolates oxygen and water vapor outside the tank, making it unable to enter the tank.3、There is a date recording ring on the lid to record the canning date or roasting date of coffee beans and flour; rotating the turntable can be adjusted to the month of the storage day, and the rubber ring outside the disk can be adjusted to the storage date of the day.4、Comes with a stainless steel coffee spoon, which can be installed on the jar to provide you with a ideal measurement for more precise brewing.5、It is suitable for the storage of dry food such as coffee beans and tea leaves. Portable, suitable for family and travel; also a beautiful gift for relatives and friends.