Watches Men Holzkern Gamma (Olive/Olive) Once an atomic nucleus has decayed, it will then emit three types of radiation: one is electromagnetic and the other two are particle beams. The resulting high-energy electromagnetic radiation is called gamma radiation. Our model Gamma features beautiful olivewood used in the case as well as the bracelet, and a curved, scratch-resistant sapphire crystal. This model also includes a chronographic stop-watch function. Specifications Case: 42mm diameter, made of olivewood and brushed stainless steel in grey Dial: Olivewood with a fine grain Movement: Solar movement by Epson Bracelet: adjustable length, made of olivewood and brushed stainless steel in grey