The Duotone Foil Wing has a unique design that uses a rigid aluminum boom instead of handles. The boom is made from high end aluminum and adjusts from 115cm to 175cm in length, so it fits all sizes of the Duotone Foil Wing. If you have multiple wings in different sizes - you will only need one boom that will work with all of them! Easy to adjust and easy to assemble - a lot of thought went in to the development of this boom. Having the a rigid aluminum boom allows you comfortable slide your hands to the position that works best for the conditions and to allow even pressure on both arms. When the wind is light and pumping can get you up on the foil, having a rigid boom allows that to happen.