5inch, 6inch, 7inch, 8inch, 9inch, 10inch, 11inch, 12inch 8sizes options, choose the one you want, we also have red and blue colors, contact me if any request. Specifications: Made of high quality carbon fiber and aluminum material, durable to use. Super light carbon fiber with 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 under water. Item Name: Camera Underwater Float Arm Material: Aluminum Alloy, Carbon Fiber Features: Durable, Easy to Install, Waterproof, Camera Supplies Product length: 5inch, 6inch, 7inch, 8inch, 9inch, 10inch, 11inch, 12inch Product gro weight: 53g, 55g, 57g, 59g, 61g, 63g, 65g, 67g Product buoyancy: 39g, 47g, 55g, 63g, 71g, 79g, 87g, 95g Net buoyancy: -14g, -8g, -2g, 4g, 10g, 16g, 22g, 28g (There's different buoyancy due to many reason, these datas are just for reference, please kindly notice it) Notes: Please allow slight dimension difference due to different manual measurement. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. The color of the aluminum alloy parts will be changed by factory, but the quality is same, please take it into account before ordering. Thanks understand. Package Includes: 1 x Camera Underwater Float Arm (Others Not Included)