Mark of “Authentic tin” engraved on the back of the sake cup
Tin, safe to the human body, is said to absorb impurities and purify water and has been used for drinkware for 1,300 years. All gekka products are made of authentic tin with a proof mark engraved on the bottom. Authentic tin generally contains 95% to 97% tin. Osaka Suzuki warrants that 97% or more tin is used. The sake becomes pure and mellow when it is poured into authentic tin drinkware and becomes mellower when it is warmed. Tin has high heat conductivity, enabling fast warming and maintaining the fragrance. Tin drinkware is easy to care for with no smell as it resists oxidizing and rust.