The Hyperion Buoyancy Foam Float Tube Set contains two high density foam buoyancy tubes. Any 25 mm outer diameter arm can go through the middle, allowing you to add buoyancy to your underwater camera system.
Outer diameter: 5.5 cm
Inner diameter: 2.5 cm
Length: 7 cm
Buoyancy: +0.14 kg single float and +0.28 kg double float
Fits any arm system that has a 25 mm outer diameter, like the new style Ikelite arms, I-Dive arms and many others.