The body of the balloon was made with "habutae," a smooth, glossy silk cloth with a fine weave, coated with resin rubber melted with sesame oil, and hydrogen gas, generated from the reaction of iron and 10 barrels of sulfuric acid, filled in the balloon.
ガス球部分には胡麻油で溶かした樹脂ゴムを塗布した羽二重を用い、鉄と硫酸を樽10個を使って発生させた水素ガスを内部に封入した。