Professional Cushion and Flex Vent Brush Sets are for professional use. Sets are included 2 different flexible vents and 1 cushion brushes. These set is for gentle detangling of hair with comfortable grips and smooth bristle. They are ergonomic design and it is gentle massage your scalp and smoothen your hair. Brush head is arc(concave) shape so it is easy to brush your hair. Because of shape is identically following you arc of scalp, most of brush tip follows contours of surface of your hair and scalp compare to other hair brush. The Flex Vent brushes in this brush sets are for drying, massaging, smoothing, detagling your hair. Unlike traditional brushes it avoid snag on tough knots so it decrease damage and detangles on all hair types. It's flexiblility allows hair brush tips follow your contours of your scalp. flex brush provides the perfect amount of pressue and stimulation, not hearting your scalp and it reduces tiredness while making hairstyles long periods of time.