Rock & Ruddle Large Thin Multicolored-Stripes Mixed-Bristle Hairbrush Details #ONLYATNM Only Here. Only Ours. Exclusively for You. Welcome to Rock & Ruddle Beautiful natural boar-bristle hairbrushes, blending quality, function and fashion Boar bristles are strong and resilient, and have a natural stiffness that means that they brush the hair thoroughly, yet don't pull as they are drawn through it. The bristles have microscopic scales that release and drag the sebum (natural oil) that is produ.