Jewelers use 1/2 Gram Rhodium Pen Plating Solution. Concentrated pen plating solution. Price can change due to market. Hazardous shipping fee will apply. Jewelers use Rhodium Concentrated. To be used with any of our pen platers right from the bottle. All of our concentrated plating solutions contain 2 grams of precious metal. Guaranteed! Hazardous Shipping fee will be Added.