Styling set with four OI products for thick hair types.Styling set with four OI products for thick hair types Add softness and shine to thick, frizzy and coarse hair with our OI Styling Set. This set includes four products from our best-selling OI line: OI Shampoo, OI Conditioner, OI Oil, and OI Hair Butter. Four luxuriously nourishing hair products made with Roucou oil to give you your best hair days yet.