The unique fibers in this new synthetic brush offer a fluid retention capacity equal to no other. The wavy, undulating shape of the fibers in the Raphaël Aqua Soft brush creates spaces that hold water molecules — in contrast to conventional synthetic fibers, which are straight and slippery. - Raphaël Soft Aqua Brush - Flat, Size 18, Short HandleRaphael Soft Aqua Brush, SOFTAQUA FLAT SZ 18 -