Mechanical Engine Biker Ring — 20g Solid .925 Sterling SilverGears, cogs, bolts, and screw heads layered together in a 3D collage across the entire ring face. The background is oxidized black on purpose, so every polished mechanical element stands out against the dark surface like chrome on asphalt. This mechanical biker ring is cast in solid . 925 sterling silver at 20 grams. The face measures 20mm 23mm. Industrial machinery, scaled down to fit your finger. Wear This If If you ride and appreciate what's under