Magnetic ring removably attachable to a pencil or eraser

A magnetic ring suitable for being fixed removably onto a pencil or an eraser, the smaller internal diameter of the ring being between 1.5 mm and 3 cm, the ring comprising:

• a cylindrical inner face centered on a longitudinal axis and an outer face opposite the inner face,
• a magnetic material distributed in a magnetic layer around the longitudinal axis in such a way that the direction of the overall magnetic moment of the magnetic ring is parallel to the longitudinal axis, wherein the ring includes an elastic material, distinct from the magnetic material, that is elastically deformable between:
• a rest position corresponding to a first value of the internal diameter of the ring, and
• a deformed position corresponding to a second value of the internal diameter of the ring, the difference between the first and second values of the internal diameter being greater than or equal to 1 mm, this elastic material exhibiting a Young's modulus at 25° C. less than or equal to 1 GPa.