The
Hierarchical Structure of Cuticles
chitin molecules
α-chitin chains
nanofibrils
proteins
fibrils
bundles
Bouligand structure
Rabbe D. et al. The crustacean exoskeleton as an example
of a structurally and mechanically graded biological nanocomposite material Acta Materialia 53 (2005) 4281
American lobster claw