Yes, like most ceramics and the majority of ocarinas it is pottery (tho' quite robust fired to 1010centigrade) -this is the reason for most of our models having safety cords.
Briefly they are fashioned from burnished black reduced earthenware and are the best obtainable at any price anywhere.Our 7-hole full range chromatic ocarinas are similar to the 6-hole pendant illustrated on our index page, with the addition of a semi-tone lip-hole. The fingering patterns and other info are on our "ocarinas" page. the mathematical proportions of the progression of notes can be compared to those of Fibonacci. Certain shapes have an effect on the timbre but the only shape to substantially affect the pitch is toric.