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A hair diagram typically shows the various parts of a hair strand, including the cuticle, cortex, and medulla. The cuticle is the outermost layer that protects the hair shaft. The cortex is the middle layer and contains melanin, which gives hair its color. It also provides strength and elasticity to the hair. The medulla is the innermost layer, though it may not always be present in every strand of hair. Additionally, a hair diagram may also include other details such as the follicle, root, and bulb. This diagram can be useful for understanding the structure of hair and how different factors can affect its health and appearance.

The main products in a hair diagram are shampoo, conditioner, hair styling products (such as gel, mousse, or hairspray), and hair treatments (such as masks or serums).