1) Material: stainless steel, aluminum, copper 2) Diameter: approx. 50 x 28mm, customers' sizes available 3) Thickness: 0.5 or 0.8mm or 1.0 or 1.2mm 4) Logo: made by silkscreen printing or offset printing 5) Plating: without electroplating 6) Coating: epoxy 7) Attachment: iron ball chain 8) Glow in the dark optional