We know hair extensions. It's what we do. That's why we've created a hair extension brush with protection in mind. Hair Extensions are expensive, so we know you want to get as long as possible out of them. The Belle Brush is a hair extensions brush like no other. Soft nylon bristles glide through your roots to prevent matting, without pulling on your extensions, while shorter boar bristles distribute natural hair oils from the root down to the tip to prevent dry, frizzy ends.