Final answer:
Wand mascaras may include keratin, collagen, and silk proteins to lengthen and thicken the hair fibers.
Step-by-step explanation:
Wand mascaras may include keratin, collagen, and silk proteins to lengthen and thicken the hair fibers. Keratin is a fibrous protein that is a main component of hair and helps to strengthen and protect the hair. Collagen is another type of fibrous protein that can help add thickness to the hair. Silk proteins can also provide conditioning and nourishing benefits to the hair.