Erasable & retractable pens !! Write Delete Repeat without damaging documents.No wear or tear !Revolutionary metamocolor ink technology - thermo-sensitive Gel ink disappears with friction using rubber tail plug on the penwith no debris (ink disappears at about 60°C and recovering temperature is around -10°C).Frixion ball can write repeatedly on the same spot with the same pen.Rubberized grip to ensure comfortable writing.Ideal for SudokuPuzzles crosswords and everyday writing.¢Strickly not recomended for signaturesexamination paperscheques or official documents where writing needs to be of a permanent nature. Tip size :- 0.7 mm Fine tip