SWISS-made C3 Super-luminova - With the brightest standard LumiNova based on non-radioactive and nontoxic afterglow pigments, activated by sunlight or artificial light Diamond-like Carbon Coating - With excellent bio-compatibility, applied on the Z Series skeleton automatic watch to lower friction, enhance hardness, and offer extended durability. Sophisticated Yet Robust - Carved from 316L Marine Grade Stainless Steel