These Eraser Mono Refills from Tombow are perfect for very fine and detailed work especially for erasing highlights into graphite. They will help you to erase as precisely as you draw with a pen or pencil, giving you excellent control and precision. Each of the erasers are round in shape with a diameter of approximately 2.3mm. They come in a pack of 2 with the eraser itself measuring 50mm in length and can be operated with the push button that is located at the top of the pen. These erasers fit the Striped Eraser Pen from Tombow. - Brand: Tombow - Eraser pen refills - Pack of 2 - 2.3 mm diameter - 50 mm in length - Ideal for creating highlights in graphite - Gives precise and accurate control when erasing