This canister is designed with a double-layer structure together with an inner lid to keep out oxygen, humidity, light, and strong smells that can cause tea leaves to degrade. It's also ideal for storing coffee and black tea, as well as Japanese green tea.
Over time, its color and feel will change and it will become more comfortable to hold.
Kaikado will handle maintenance needs you may have related to problems occurring after purchase related to usage, such as corrosion or the lid no longer closing.
http://www.kaikado.jp/