Brazilian Blowout. They're manufactured in France exclusively for Salon AKS, made of silk and designed for smooth and shiny blowouts.
I tested the large and small round brushes at home. The bristles really grab your hair, so much so that you need to use some extra pull to get them through. The results are worth the effort, though, they left my hair much sleaker than my old, synthetic standby. The brushes are available in the NYC salon and on line.
This review was based on a sample.