Powder Coated Cast Iron Kettlebell is cast in one solid piece, further ensuring a smooth surface and creating a stronger, more reliable handle. These bells don't use plastic caps, plugs, or patches like lower quality products. To ensure each bell has a smooth finish free of defects, we use a proprietary casting process that allows us to prevent voids and virtually eliminate the seam on the handle. We use different color ring to help users quickly distinguish different weight options.