Scope of application: suitable for diving photography, single and double handheld brackets, suitable for -single lens, SLR camera waterproof case, suitable for , , , , Function and use: for extension and expansion equipmentFeatures and selling points: 1. New upgraded double ball head hollow design to reduce self-weight;2. Double steps increase layering3. Ultra-light extension light arm, under water, the weight of 5 inches specifications is up to 14gMaterial: metalColor: blackSize: 140*25*25mmProduct specifications about: outer diameter D20mm, length: (distance between two O-rings) 5 inchesProduct buoyancy approximately: 39gProduct net buoyancy is about: 14gPackage Contents:1 * 5-inch carbon fiber buoyancy light armOnly the above package content, other products are not included.Note: Light 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.