North Sonar HM Carbon MastPremium High Modulus pre preg carbon mast engineered impossibly thin and impressively fast over 15% thinner than standard carbon masts with increased bending and torsional stiffness. The North Sonar HM Carbon Mast represents the pinnacle of foil mast technology. We've reduced the thickness of the submerged portion by over 15% compared to standard carbon masts while simultaneously increasing both bending and torsional stiffness. Available in three