The hardness of a species is determined by the Janka Rating, this measures the resistance to indentation and abrasion. As a guide the higher the rating number the more resistant the timber is to indentation and abrasion.
These properties are only a guide, as timber is a natural product there will be variations within any species.
These packs contain lengths from 0.9m to a maximum of 6.0m. Not every pack will contain 6.0m lengths and whilst the average length will vary, it will usually be between 2.1m and 3.0m.