Exceptionally soft bristles with a fantastic firm “backbone” make this the last brush you’ll ever need to purchase! The Rockwell Synthetic Shaving Brush comes with a lathe-turned black acrylic handle. Polyester bristles – the softest synthetic bristles we had ever come across. Completely animal free. Durable, taught and sturdy bristles build a thick, foamy lather, while gently exfoliating the skin. 22mm knot.