【Features】 Quickly and cleanly erases memorization pens. 【Product Specifications】 External Dimensions (Shaft Diameter/Length) (approx.): Shaft diameter φ13 x Length 120 Specifications: Medium-point square tip, transparent (erasing ink) Material: [Shaft, Tail Plug, Cap] PP Ink Specifications: Water-based erasing ink Outer bag dimensions (approx.): Width 40 x Height 200 Water-based erasing ink Ventilated cap 【How to Use】 Erase the green markings of the memorization pen by lightly tracing over them 1-2 times. *The memorization eraser pen is for the green ink of memorization pens only. Other colors will not erase. *Areas erased with the memorization eraser pen cannot be overwritten with the green ink of the memorization pen. 【Precautions for Use】 Please read the instructions before use and use correctly.