What is a double contrabass flute like?

The double contrabass flute has become a common part of full orchestras in recent years, having been born of a need for an instrument with a lower range. A normal bass flute has a range one octave below a normal flute, but the double contrabass flute has a range that is three octaves lower than the flute. In terms of dimensions, it is 5m long, weighs 12kg, and the inner diameter of its pipe is 78.4mm.