Hair bundling core and method of using the core

A hair bundling core structure comprising:

• an elastic cylinder for use as a hair setting base for supporting a hair style, the cylinder having a coaxial hole adapted to receive a hair bundle,
• said elastic cylinder being made of a foamed synthetic resin having a thickness and strength which are sufficient for facilitating a piercing of a hair setting U-shaped pin into and an extraction of the U-shaped pin from the elastic cylinder and for fixing hair to the elastic cylinder by the piercing of the U-shaped pin,
• whereby said elastic cylinder has a pair of end surfaces, and is cut from one end surface to the other end surface to form a rift,
• wherein the elastic cylinder is deformable between a closed state, and an open state in which the rift is elastically opened to allow a bundle of hair to pass into the coaxial hole, and the elastic cylinder is adapted to elastically restore from the open state to the closed state.