Description: Made of high quality carbon fiber and aluminum alloy material, durable to use Super light carbon fiber with a 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 Ideal for shooting water activities photos, or diving underwater 100 meters Specification: Material: Carbon Fiber Aluminum Alloy Size Chart: Size: 5inch 127x60mm/5.00x2.36inch 8inch 203.2x60mm/8.00x2.36inch Buoyancy coefficient D=60mm L=5inch F=108g D=60mm L=8inch F=310g Package Includes: 1 Piece Buoyancy Aquatic Arm Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!