If you have a desired inner circumference, please be sure to let us know before purchasing. It will cost an additional 50 yen for every 1 cm increase. Reducing the size is free. Inner circumference: Approximately 16cm (stretches) Genuine crystal (approximately 12mm) (approximately 8mm) Cut genuine crystal (approximately 8mm) Abacus crystal (approximately 3 x 6mm) *The number of stones may vary depending on the size. ◆Genuine Crystal It is said to be a versatile power stone that corresponds to all situations, places, and events. It is said to awaken and awaken potential abilities and power. *Because they are natural stones, the color and pattern may differ even for the same stone. *The color may differ from the actual product depending on the lighting. In addition, natural materials may have cracks and inclusions. Please understand this in advance.