What is a Cassette Headrail on Roller Shades? Fascia Valance

Listed in your roller shades area is the term "Cassette Header". What exactly is that?

Standard roll up shades come with a visible roll at the top of the shade where the fabric or material is visible. We offer a cassette headrail or fascia valance upgrade to hide this roll. By adding the casette headrail, the roller shade looks cleaner.

Fascia valances are available in either a painted, color coordinated aluminum or a fabric wrapped option. With a fabric wrapped fascia, the aluminum fascia valance is wrapped in the same fabric as the shades.