Our high quality underwater float arm is made of carbon fiber, triple waterproof structure design effectively prevents water leakage, and the hollow arm design reduces weight while generating super buoyancy. For diving enthusiasts and photographers, this product is a must-have for capturing amazing underwater moments Outside diameter D60mm, length (O-ring distance) 5 inches, individual weight 0.31 lbs/138g, provides 108 grams of buoyancy/each. Our carbon fiber buoyancy floating arm will effectively enhance your diving photography experience 1” ball head is widely compatible with underwater photography accessories, providing excellent buoyancy for your camera, flashlight, underwater diving light arm tray system, ideal for diving enthusiasts and photographers looking for high quality underwater gear Aluminum alloy wrap-around design gives better protection to the carbon fiber float arm, increasing its resistance to falls and pressure, avoiding carbon fiber tube falls and pressure injuries Impressive depth rating: this float arm is rated at 100 meters/328 feet for deep sea diving, helping you to better capture great underwater photos LetonPower Black 5" Carbon Fiber Underwater Float Arm (2-Pack) - Ultralight Dual 1" Ball Buoyancy System for Diving Tray Video Lights & Strobes