Tombow Mono Zero is a high-precision eraser for pinpoint erasing. This ultrafine 2.3 mm eraser allows to erase a single letter and correct a detailed drawing. This light-touch synthetic rubber eraser only requires a light pressure to remove pencil marks clean without damaging the paper. Short-pitch knock mechanism. The unique indirect chucking system extends the eraser by only 0.7 mm with each push. Metallic long guide pipe prevents the sleeve from obstructing your view and allows you to see the part you want to erase. It can be handled like a drafting pen. It is ideal for designers, architects, artists and cartoonists. Easily refillable: Push and hold the knock button on the main body and insert the eraser with the plastic stick from the tip of the sleeve to replace the eraser. It comes in 2.3 mm round shape.