The Hair Brush Round 9511-81 is a professional styling tool typically used for blow-drying and smoothing hair. It features a round brush design with a mix of nylon bristles and boar bristles for better tension and control while styling. The vented barrel allows for even heat distribution, reducing drying time. The brush is ideal for creating volume, curls, or smooth finishes. The number 9511-81 likely refers to a specific model or size variation.