The Aarni Sirius silver birch tree watch is made from a genetic variety of silver birch grown in Hartola, Finland. The gold details harmonise beautifully with the silver birch. The metal parts of the watch are 316L surgical steel and it is powered by a Japanese Miyota 1L45 quartz movement. The wooden case is 42 mm wide and 8.5 mm thick. The green dial is protected under the mineral glass. The bracelet is 20 mm wide and you can adjust the length to your personal preference using the tools provided. The watch is water resistant to 50m/5atm, which means it has limited water resistance (swimming is not recommended). Aarni watches are guaranteed for 3 years and come in the original manufacturer's box.