Made of high-quality carbon fiber and aluminum alloy material, durable for use Super light carbon fiber with a double ball design, helps keep the arm buoyant This float arm is suitable for both macro and wide angle photography Lightweight and highly durable double ball joint design Ideal for capturing water activity photos or diving underwater up to 100 meters Specification: Material: Carbon Fiber Aluminum Alloy Size Chart: Size: 5 inch 127x60mm / 5.00x2.36 inch Size: 8 inch 203.2x60mm / 8.00x2.36 inch Buoyancy coefficient: D=60mm L=5 inch F=108g D=60mm L=8 inch F=310g Package Includes: 1 Piece Buoyancy Aquatic Arm Note: 1. Please allow slight variation due to manual measurement 2. Due to differences in monitor displays, the picture may not reflect the actual color of the item