The table below shows the hardness of different species of wood and the higher the number the harder the surface of the flooring. As you can see the strand woven Bamboo is one of the hardest flooring options available today, the Brazilian Walnut is a species in the rainforest and is most certainly illegally logged if you can get it we do not agree with such criminal practises so we offer the strand woven Bamboo as the greenest option available. Bamboo is one of the fastest growing plants and is harvested every 5 to 6 years. See the bottom of the table.
 
Janka Hardness Scale(Ibf)
Noth American Cherry 950
North American Walnut 1010
True Teak 1155
Iroko 1260
Yellow Birch 1260
Red Oak 1260
Beech 1300
Ash 1320
White Oak 1360
Royal Mahogany 1400
Caribbean Walnut 1400
North American Maple 1450
Brazilian Maple 1450
Timborana 1570
Engineered Bamboo 1690
Kempas 1710
African Paduak 1725
Solid Bamboo 1762
Doussie 1770
Pecau 1820
Hickory 1820
Distressed Bamboo 1887
Jarrah 1910
Merbau 1925
Santos Mahogany 2200
Caribbean Rosewood 2300
Chestnut 2426
Tiete Rosewood 2800
Brazilian Cherry 2820
Strand Woven Bamboo 3014
Brazilian Teak 3540
Tiete Chestnut 3540
Brazilian Walnut 3680