Correct Writing Post Pen Set

This pen can protect you from myopia, stooping and so on, bad writing habit. Keep you write in correct posture. There are three pieces ball-point pen cartridges, three pieces gel pen cartridges, one pencil with the pencil cartridges and the pen shell in one packing box. New function pen with helping children to write in correct. 7 7/8" L x 3 15/16" W x 1 5/32" H