SAY GOODBYE TO KNOTS TANGLES Ordinary bristle brushes work against the hair, basically ripping through and pulling out the knotted hair instead of gently separating it. But the unique cone-shaped plastic bristles work to separate the hair sideways instead of down, gently unraveling even the toughest tangles. ON-THE-GO SIZE Flexes to fit cup holder between 2 to 4 inches in diameter. Fit most phones, with or without cases accessories, and allows phones to be mounted horizontally or vertically.