◾️phiten RAKUWA Necklace EXTREME Wire Tornado ◇ Lightweight design that feels like you're not wearing anything ◇ EXTREME model x 2-strand wire ■ Color (manufacturer's notation): Blue x White (Ultramarine Blue/White) ■ Materials: Body: Stainless steel, nylon; Clasp: Aluminum, urethane ■ Size: L: Length/50cm ■ Weight: 51g ■ Medical device certification: None ■ Capacity: 1 piece ■ Country of origin: Japan Color: Rare Ultramarine Blue/White 50 centimeters Used for a short time, about 2 days I haven't done any sports or activities that cause sweating.