ga sails black line gabelbaumWe present the GA Sails Black Line Boom. A unique conical design provides additional stiffness in the rear section of the Black Line boom. Laboratory tests show that it is on average 20% stiffer than the Green Line. A double push pin system guarantees strength and durability at all times, while the GA Boom Grip provides a fantastic feel for your rig. Each length of the Black Line is bent differently to get the best performance out of every size,