Spheres (balls) are available in steel, stainless steel, and aluminum and are supplied with a mill finish with a weld seam that is ground flush. Spheres (balls) are hollow and come with a 1/4" hole on one side. 8", 10", and 12" spheres are spun and have a 1/4" thru-hole. These are great for a variety of ornamental applications. Sizes range from 1-1/2" up to 12"