 During filming, Kong's rubber skin dried out quickly under studio lights, making it necessary to replace it often and completely rebuild his facial features.A huge bust of Kong's head, neck, and upper chest was made of wood, cloth, rubber, and bearskin by Delgado, E. B. Gibson, and Fred Reese.Inside the structure, metal levers, hinges, and an air compressor were operated by three men to control the mouth and facial expressions.