"The Black line is uniquely tapered to provide extra stiffness in the back section of the boom. Tests indicate it to be 20% stiffer than the Green line! The new boom head provides a tight connection to the mast while a double push pin operating system guarantees strength and durability. Different bends for each size range make this boom a perfect compromise to carbon performance. Our new look GA boom grip adds the finishing touch to give you the ultimate feeling of your rig."