Mason Pearson Junior The Mason Pearson Hairbrush cleans the hair and stimulates the scalp, increasing blood flow to the roots. Contains bristle & nylon tufts. 8 7/8 inches. About Mason Pearson: In the late 1800s, founder (and engineer) Mason Pearson introduced inventions that revolutionized the approach to making hairbrushes. Today, the unique rubber-cushion pad on each Mason Pearson brush is still made by hand and each handle is hand polished, using Mr. Pearson's original techniques.