No price has been set but it is definately arguable that these pieces will be well into the six figures if not into the millions. Richard Mille has taken the skull concept by boldly integrating it directly into the design of timepiece. Grade 5 titanium is used for the base plate of the skull, and the upper and lower jaws hold the ruby of the tourbillon cage. The skeletal baseplate and bridges were subjected to rigorous testing, insuring optimal durability. Only 21 pieces of this limited edition will be made. 15 pieces in titanium and 6 remaining pieces in red or white gold.