Tombow Mono Stick is an easy-to-use retractable pen-type eraser. This eraser of 6.7 mm in diameter is ideal for erasing single letters in 7 and 6 mm ruled notebooks quickly. The clipless body does not take up much space in the pen case. It has knock mechanism. The eraser can be extended quickly and protected from smears when stored. The rolling stopper attached to the end tip prevents the eraser from rolling and falling. The transparent body allows you to see the remaining amount of the eraser. It is refillable. You can refill the eraser from the end tip of the sleeve.