100% high modulus carbon fiber, 65mm wide cuttlefish section, that extends 74cm 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. 8cm of unfilled depth on each end for installation of the handle and muzzle spigots. Available in lengths from 90-110cm. Ideal for 7-8mm diameter shafts.