Made entirely of resin, it will not rust from sweat or seawater, allowing for smooth opening and closing like new for a long time. Also, the internal structure is not completely hollow, but reinforced, so it is strong enough while being ultra-lightweight at 46g. - Color: Silky White - Size: Approximately 18cm x 10cm x 1.8cm - Strength: Static tensile strength 20kg - Weight: 46g - Brand: OPAL