The mineral crystal used in AXF (アクセフ) necklaces has been proven to increase blood nitric oxide levels and dilate blood vessels. Users report that wearing the necklace reduces fatigue, improves range of motion, and stabilizes the core. (However, individual results may vary.) ■Color: 22 (RED) ■Total Length (circumference): Approximately 54cm ■Material: Silicone rubber ■Features: Thank you for viewing.