The Wheel part of the Kiwi is made from composite materials (customwood) so it is actually more stable than solid timber products. The rest of the wheel is made from Southland Silver Beech. As with all wooden products a protection from dry moist climates is achieved by coating the product with a finish.
Either the Ashford wax finishing kit or a Danish oil finish would be suitable. The customwood can also be stained with NGR stain and lacquered over the top.