They are made up of two half-shells whose internal and external diameters and total buoyancy are adapted to demand. The floats are assembled using a hinge and stainless steel or galvanized steel screws.
The floats are filled with closed-cell eps foam with different density in base of the hydrostatic pressure the floats need to withstand.
The two halves are connected each other on the pipe through four steel bolts, two each side to ensure optimal clamping with the pipe.