Landyachtz Longboard Complete Bamboo Drop Hammer 2014 Profile: Rocker. A mild rocker design allows the board to feel natural under foot and drives you down in to the board. . Concave: Medium W. Medium W concave allows the board to suck your feet into it while still remaining flat enough for urban riding and dancing on the board. Material: Bamboo and Fiberglass. A bamboo core keeps the board ultra light while the fiberglass leaves the Drop hammer poppy and responsive. Mounting: Drop Through. Drop through designs allow the board to have a lower center of gravity and provide you the ability to turn from the center of the truck.