Made of high-quality carbon fiber, aluminum material, Stainless Steel, durable to use. Upgraded Version, Seal ring to prevent leakage, Tie rod to prevent falling off, Anti-pressure reinforced models Triple waterproof structure design, Strictly prevent water leakage Stainless steel 304 tie rod, Solve the deep-sea pressure, The aluminum alloy cover is not loose and does not Super light carbon fiber with a dual double ball design, can keep the arm buoyant. This float arm is both for macro and wide-angle photography. perfect for water-activities photos, or diving underwater 100 meters. about 108g Buoyancy Item Name: Upgraded Dia 60mm Camera Underwater Float Arm Features: Durable, Easy to Install, Waterproof, Camera Supplies Colour:black Material:carbon fiber Size: Arm Diameter: 6cm/2.36 inch, Length: 12.7cm/5 inch, Ball Diameter: 2.5cm/0.98 inch (.) , Package Contents: 1 x Camera Underwater Float Arm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.