Impregnated cast iron kettlebells have good pits. The pockmarked surface of cast iron kettle bell can make the workpiece beautiful and protect the insulation and appearance of the workpiece. Smooth surfaces are easy to clean, wear-resistant, prone to scratches, and the scratches are obvious and difficult to repair. It's best to choose a foggy pockmarked surface, which has a matte feeling, is very wear-resistant and has no obvious scratches.