There are cups made of 100%v pure tin. Tin is said to purify water and make drinks mild by the effect of ions. Please use for drinking beer, whiskey, wine, sake, shochu, iced coffee and various soft drinks according to your preference. The wide rim makes it perfect for sprits on the rocks or with water. The cup will cool as the ice melts over time keeping your drink the perfect temperature. Also because the thermal conductivity is good, you can enjoy the refreshing coldness simply by putting it in the refrigerator for 1-2 minutes. Also there are glasses, which are a combination of glass and wood directing a unique and warm space.