Cobalt Blue glass lightning rod ball. Newly made just like the old ones. Fits a standard 5/8 inch lightning rod. Balls are approx 4 1/2 inch across just as the old ones. The way these are made, expect some slight chips along the openings. These will take a 1 1/4 inch caps. We had these about 3 years ago and just had another batch made. Very nice product. Please check our other listing for Ruby Red  ones. Thank you