The Han MMore Info The case: 100% Walnut Wood and Stainless Steel. This wood has high density which together with the steel completely blocks the water from getting into the movement. Walnut Wood has obvious wood pores. The wood will turn darker and shinier when used for a long time. The straps: the leather band is a pre adjusted buckle which required one off size adjustment. Changeable without the need of any tool Movement: Japan Seiko Chronograph Quartz 5