Hokkaido Kaminokuni-cho Black Silica Bracelet 10mm, 16cm (approx. 6.3 inches), but other sizes are also available. Approx. 6mm - 11.2mm Approx. 16cm (approx. 6.3 inches) 6mm (approx. 0.24 inches) 6.5mm (approx. 0.26 inches) 7mm (approx. 0.28 inches) 7.6mm (approx. 0.30 inches) 8mm (approx. 0.31 inches) 8.5mm (approx. 0.33 inches) 9mm (approx. 0.35 inches) 9.5mm (approx. 0.37 inches) 10mm (approx. 0.39 inches) 11.2mm (approx. 0.44 inches) sphere 11.8mm (approx. 0.46 inches) 12mm (approx. 0.47 inches) - 500 yen up 14mm (approx. 0.55 inches) - 1000 yen up Due to the nature of natural stone: Sphere size: ±0.5mm (approx. ±0.02 inches) Wrist size: ±0.5cm (approx. ±0.2 inches) error may occur, and there may be scratches or slight color variations. Wrist size: 12cm - 17cm (approx. 4.7 - 6.7 inches) - custom order Before or after purchase, we will make it to your specifications (mm sphere and cm length). For example, 8mm (approx. 0.31 inches) and 16cm (approx. 6.3 inches). The glossy Black Silica is a ceramic processed product made from powder, but this is polished from the original stone, so it doesn't have much gloss, and some may have slight cracks. Genuine Black Silica conducts a small amount of electricity.