Janka Hardness shows the ability of wood species to withstand indentations. Generally speaking the higher the number, the harder the wood. However it should be used only as a general guide. The type of construction and finish also play an important role in the durability and ease of maintenance of any wood floor. Please remember that all wood flooring can be scratched and dented if something heavy or sharp is dragged or rolled across the flooring or if stones and grit are ground into the surface of the wood from foot traffic.