BGNing Carbon Fiber Float Buoyancy Aquatic Arm Dual Ball Floating Arm Extend Bracket D60MM Camera Underwater Diving Tray for Gopro Smartphone Specifications: Made of high quality carbon fiber and aluminum material, durable to use. Super light carbon fiber with double ball design, can keep the arm buoyant. This float arm is both for macro and wide-angle photography. Lightweight, highly durable double ball design. Item Name: Camera Underwater Float Arm Material: Aluminum Alloy, Carbon Fiber Features: Durable, Easy to Install, Waterproof, Camera Supplies Size: Arm Diameter: 4cm/1.57", Length: 30.48cm/12", Ball Diameter: 2.5cm/0.98" (Approx.) , 200g Buoyancy Arm Diameter: 4cm/1.57", Length: 35.56cm/14", Ball Diameter: 2.5cm/0.98" (Approx.) , 300g Buoyancy Arm Diameter: 6cm/2.36", Length: 12.7cm/5", Ball Diameter: 2.5cm/0.98" (Approx.) , 90g Buoyancy Arm Diameter: 6cm/2.36", Length: 20.32cm/8", Ball Diameter: 2.5cm/0.98" (Approx.) , 300g Buoyancy Arm Diameter: 6cm/2.36", Length: 25.4cm/10", Ball Diameter: 2.5cm/0.98" (Approx.) , 350g Buoyancy Arm Diameter: 6cm/2.36", Length: 30.48cm/12", Ball Diameter: 2.5cm/0.98" (Approx.) , 400g Buoyancy Arm Diameter: 8cm/3.15", Length: 12.7cm/5", Ball Diameter: 2.5cm/0.98" (Approx.) , 400g Buoyancy Arm Diameter: 8cm/3.15", Length: 20.32cm/8", Ball Diameter: 2.5cm/0.98" (Approx.) , 600g Buoyancy Arm Diameter: 8cm/3.15", Length: 25.4cm/10", Ball Diameter: 2.5cm/0.98" (Approx.) , 800g Buoyancy Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. The color of the aluminum alloy parts will be changed by factory, but the Quality is same, please take it into account before ordering. Thanks for understanding. Package Includes: 1 x Camera Underwater Float Arm (Others Not Included)