The 3DL M-10 All Purpose Mainsail is developed to compliment All Mast Sections, it is Manufactured from carbon kevlar 680m. --The m-10 3DL, like its panelled sister the m-10t, is an all-surpose sail. A One-Piece Thermo-Molded Sail Manufactured Using North Sils OWN Unique 3DL Process. Standard Mainsail Features: Class Insignia Sail Numbers Epoxy Battens Leech Tell Tales Leech Line Long Roll Bag