According to William Shaker, market development manager of Polymer Additives at Potters Industries, "No one conventional additive can match the multiple performance benefits of SPHERICEL hollow glass microspheres. Because they are made of colorless glass they do not discolor light or pastel formulations. Their hollow structure, low density (0.60 and 0.34 g/cc) and small particle size make them ideal for use as extenders for paint formulations."