Wolfgang Concours Series WG-4700 Black Diamond Tire Gel, 16 fl. oz. Cutting edge polymer technology to protect tires from rubber-aging contaminants, like dirt, ozone, and UV radiation. Blocks out UV rays to prevent drying, aging, and fading. Wolfgang Black diamond tire gel Penetrates beneath the surface to give your tires a long-lasting true glow that lasts weeks rather than days.