100% high modulus carbon fiber. 77mm wide cuttlefish section, that extends 95cm before rounding out on each end. 26mm ID/31mm OD/2.5mm wall thickness/2.85mm track offset. 
Filled with a special epoxy foam that does not absorb water, provides greater buoyancy, and aids in recoil absortion when using thicker shafts and heavier components. 
8cm of unfilled depth on each end for installation of the handle and muzzle spigots. 
Will support up to an 8.5mm shaft diameter. 
Available in 100-120cm lengths.