Forest is crafted from Zebra Wood. It is water-resistant. The case diameter is 38mm. Glass is made of Sapphire, which is known in the luxury watch world as the definitive material for transparency and durability. It is colorless and optically clear. Mechanically, it is second only to diamond as the hardest and most scratch-resistant materials on earth. The thickness of the band is 10mm. It comes packaged in a premium R. Burnett Wooden Box and a link remover along with instructions to give you the perfect fit. Watch Specifications VD31 Battery Powered Movement (Quartz)Tuning Fork Type: Quartz crystalFrequency: 32,768 HzAccuracy: +/- 20 seconds /moBattery: silver oxide SR920SW(SEIZAIKEN)Drive System: 2-pole stepping motor Care Suggestions Lemon or orange oil extract is best for cleaning the natural wood. When storing your timepieces, please avoid extremely hot, cold, and excessively dry/humid environments.