There are several reasons that the woods can be replaced with bamboo other than growth rate. Firstly, bamboo has a considerably more heterogeneous structure than the wood. The tissue is primarily composed of vascular bundles and parenchyma. The structure resembles a fibre-reinforced composite, with the vascular bundles (composed of fibres and conducting cells) and parenchyma acting analogous to fibre and matrix respectively. The volume fractions of vascular bundles and their associated fibres increase sharply radially, going from the inside to the outside of the culm wall. This heterogeneity and the resulting density gradient are important to consider in manufacturing and modelling of structural bamboo products. For instance, the heterogeneous tissue of bamboo can lead to significant strand roughness, if they are not sliced cleanly, this could impact the bonding and performance of a bamboo product.