What pen holders are worth sharing for correcting writing posture?

Tang Jiugong feels a bit like a pistol. It can be adapted to any ordinary pencil. There are two specifications to choose from, suitable for children of different ages. The handle is actually meant to be held in the palm of the hand. For children who are not good at holding a pen, the following pole can maintain a "grip" state with the palm of the hand moderately, making it easier to control the pen during writing. Some.