Silvered Syrinx Shell . Available in 10", 12", 15", 17" and 18". Created from natural shells. Each shell is unique. Creel and Gow has been working with the same atelier in Rome, Italy for over 20 years to make our signature silvered shells. Our workshop has been operated by the same family for generations. For decades, this family has also done restoration work on silver pieces for the Vatican.