Its hairy fringes are called baleen hair or whalebone hair. Steel and baleen (whalebone) were the dominant materials for boning and were occasionally used together. Whalebone (baleen) was frequently used in bodies to maintain their stiff appearance. A busk made of wood, horn, whalebone, metal or ivory further reinforced the central front. It was a simple bodice, stiffened with boning of reed or whalebone. Other materials used for crinolines included whalebone, gutta-percha and vulcanised caoutchouc (natural rubber). At that time, the only acceptable undergarment was a corset stiffened with whalebone. At Tikigaq, they built semi-subterranean houses using mainly whalebone and driftwood. By the 1830s steel stays had begun to replace the classic whalebone. These early wingsuits were made of materials such as canvas, wood, silk, steel, and whalebone. Mysticetes have large whalebone, as opposed to teeth, made of keratin. A wahaika is a short club normally made of wood or whalebone. A Kotiate is a short club normally made of wood or whalebone. In experiments, Darwin had imitated this action using a whalebone spring. The current NC 12 shows up on the 1964 map running from Ocracoke to Whalebone.