A foil for use in hair coloring is made of a substantially rectangular sheet of material. The system includes a host system, a network link to at least one supply chain entity, and an a-source application executing on the host system. The golf club further includes means defining a reflective surface positioned so that when a user of the golf club addresses a ball an intended target towards which a said ball is to be struck is visible in the reflective surface. The return pipeline for economizing fuel oil is connected between the inlet of the catalyzing device and original return pipeline of the vehicle engine. Other embodiments are provided herein. The loudspeaker diaphragm is arranged to move substantially in anti-phase with at least a part of the noise generated by the noisy element, hereby cancelling the noise from the noisy element.