The body of the "float arm system" float arm that generates a large buoyancy in the water and allows you to control the weight of the entire camera system according to your preference, and is made of light weather resistant ABS material that is beneficial to reducing water weight. In addition, the inside of the arm is completely hollowed, thus ensuring a buoyancy with a different level of difference compared to conventional arms. Until now, the buoyancy of the arms that were just increased in the water weight, can effectively reduce the underwater weight of your camera system. Buoyancy: -4.7 oz (135 g); Effective length: 7.9 inches (200 mm); Outer diameter: 2.0 inches (52 mm); Body weight: 6.3 oz (181 g); ABS resin; corrosion-resistant aluminum alloy, rubber, etc.; Practical water resistance depth: 25.6 ft (70 m).