Externally, these glasses are the same type of conventional glasses with a smooth outer surface, but the inner form of glasses have surprised their uniqueness. It seems as if a glass of martini imprisoned in a glass cylinder! Also impressive looking wine glasses for champagne and glasses of liquor. Particularly impressive outlines of the "internal" glasses become apparent when they are filled with drinks. Note that all of these hand-blown glasses made of borosilicate slekla.