NOVELTY - The choke (3) has a single-piece core (30) i.e. single-piece magnetic core, comprising boards (302, 304) and a pillar (300) located between the boards. A winding space (S') is located among the boards and the pillar, where the pillar comprises a non-circular and non-rectangular cross section. The cross section of the pillar comprises a first axis and a second axis intersecting with each other at center of the pillar and being perpendicular with each other, where the first axis is longer than the second axis and the cross section of the pillar is symmetrical to the axes.    USE - Choke for stabilizing circuit current to achieve noise filtering effect by storing and releasing electrical energy of a circuit utilized in electronic devices such as direct current (DC)/DC converters and battery chargers, transmission devices such as modems, asymmetric digital subscriber lines (ADSLs) and local area networks (LAN), and information technology products such as notebooks, mobile phones, LCD displays and digital cameras.    ADVANTAGE - The winding space is located among the boards and the pillar, so that the cross section of the pillar provides the axes intersecting with each other at the center of the cross section of the pillar and being perpendicular with each other, thus stabilizing the circuit current to achieve the noise filtering effect by storing and releasing the electrical energy of the circuit in an effective manner. The choke utilizes magnetic material made of thermosetting resin and iron powder, so that the magnetic material can be directly heat-cured and cracking and deforming of a drum-core are avoided after the magnetic material is heated, thus allowing mass production of the magnetic material in an effective manner.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a choke.    Winding space (S')    Choke (3)    Single-piece core (30)    Wire (32)    Magnetic material (34)    Electrodes (36)    Pillar (300)    Boards (302, 304)