FEICHAO 2PCS D60mm 10 inch Buoyancy 447g Underwater Diving Photography Carbon Fiber Lamp Arm Dual Hand-Held Accessories 1 Inch Dual Ball Head Upgraded Version Specifications: Arm diameter: 6cm / 2.36 ", length: 25.4cm / 10", ball diameter: 2.5cm / 0.98 "(approx), 447g Buoyancy. Arm diameter: 6cm / 2.36 ", length: 30.48cm / 12", ball diameter: 2.5cm / 0.98 "(approx), 550g Buoyancy. Made of high quality carbon fiber and aluminum, durable to use. Super light carbon fiber with double ball design, can keep the arm floating. This floating arm is for both macro and wide angle photography. Ideal for taking pictures of water sports, or diving 100 meters underwater. Item Name: Underwater Camera Float Arm Material: Aluminum Alloy, Carbon Fiber Features: durable, easy to install, waterproof, camera supplies. Package Includes: 2 x Underwater Camera Float Arm (others not included)