The boats are made primarily from bamboo. The first step in construction is a basic framework woven from bamboo sticks. Then the bottom is further reinforced with the addition of more bamboo sticks, making the boat's base sturdy. Once the bottom is structurally sound, the lowest points of the sides are defined by a circumferential band of three flat strips of bamboo woven into the existing lattice. The sides of the boat are then made with 20 to 30 adjacent strips of bamboo. Finally this framework is again strengthened by lightweight bamboo, making sure that the sides are not heavier than the base.