The Flex Brush brush bends and flexes to perfectly meet the contours of your scalp. Soft bristles made from boar bristle and flexible nylon work well on all hair types, and are recommended for fine and medium hair textures and for sensitive scalps. The Flex Brush Petite Mixed Bristle is ideal for all hair types and perfect for extensions, and due to its small size it fits perfectly in your purse or gym bag.