Popular Mixture Bristle & Nylon Mix Hair Brush Popular Mixture Bristle & Nylon Mix Hair Brush The ultimate grooming tool, Mason Pearson's Popular Brush is handcrafted with a timeless design made of a combination of the finest natural boar and nylon bristles. Its 100 year old patented pneumatic cushion helps contour to the scalp optimizing effortless brushing, resulting in beautiful, healthy looking hair.. Premium-grade cruelty free boar bristles. Flexible handle. Nylon cleaning brush included. Measures approx 8.5 in length. Use on dry hair before showering. Brush hair regularly starting from root to tip to stimulate follicles to promote an increase in growth and shine. MPEA-UU2. MP POPULAR.