Sangria Pitcher Exquisite color, skilled craftsmen, and creative designs have made Blenko famous in the ancient craft of hand-blown glass. Over the years, talented designers have developed contemporary new designs for our skilled artisans, who have learned the difficult techniques of glass blowing through many years of practice. The uniqueness of hand-blown glass cannot be compared to that of machine-formed glass - a process which produces items all exactly alike but without character. Because our glass is made in small batches and our processes are performed by hand, it is common to observe small air bubbles, lines or individual marks left by our craftsmen. These are not flaws - but rather the distinctive nature of the hand-made process - which identify and magnify the uniqueness of each piece of glass.