... smelting, Spray painting, Flame plating, Oil injection and Oxidation (aluminum)4. RingMaterial:Iron, PlasticDiameter:16, 19, 22, 25, 28mmetc.Color:Antique ... Oxidation (aluminum) Iron, Aluminum Alloy, Zinc Alloy, Plastic, Crystal, Resin, Wooden Curtain rod finial