The Björn vases are mouth-blown in a special process from studio glass, which is glass that clearly demonstrates its handcrafted character with irregularities and tiny air pockets. Differently coloured opaque glass particles are applied to the red-hot glass before the corpus is mouth-blown. This creates an almost ceramic effect, which looks different with every piece. This unique vase should be cleaned by hand using warm water and mild dishwashing liquid. Tough limescale rings and plant residue can be removed with vinegar essence.