stainless steel hollow ball surface if mirror polishing material:304,316 spec: diameter is 40, 45, 50, 60, 70, 80, 100, 120 SS hollow ball:Diameter: 3.8-50mmthickness: 0.35-2.5mmWe are a special exporter and manufacter of Steel Ball in Hebei,China.Our factory has 1000 square meters. we have 20 workers on prduction. Metal Fence End Cap Manufacturer