ULTRALIGHT'S NEW BUOYANCY ARMS
2.5 TIMES MORE BUOYANT

Large Buoyancy double ball arm segments were designed for the heavy Digital SLR housings and video housing.
They are 2" in diameter and constructed the same as the regular buoyancy arms.
They range in size from 8" to 16" in 2" increments to be able to add just the amount of buoyancy you need
to offset the weight of the housing and strobes or lights.

With two arm lengths, 1 AC-CSB, 2 AC-CSF, and 1 strobe adapter and 1 base adapter these are the calculations:
You will need to add in the weight of your strobes underwater to these calculations to get you to the buoyancy you need.