Putter Butter is a proprietary formula developed specifically to protect and restore iron, wedge and putter heads from rust, corrosion and fertilizer. Putter Butter is easily applied with the included 11″x 12″ fiber polishing cloth and will not leave a film or oily residue after drying like and protects all types of finishes such as chrome, PVD, Oxides and even raw carbon. There is no need to use other protectants such as WD-40 or baby oil on your clubs anymore! Putter Butter last longer and is specifically formulated to repel moisture in even the most humid conditions to keep your expensive golf clubs clean from surface rust and tarnish. New and improved version for 2017 that will not harm paint fills.