The "S20" imprint is fading (see photo 4). Pilot **mechanical pencil "S20"** The body uses "resin-impregnated birch wood," which gives a warm, wooden feel. The curved design is characteristic, becoming more comfortable in your hand the more you use it. The low center of gravity design makes the pen tip less likely to wobble, providing a stable writing experience. The body is thin and the tip is long, making it easy to see the pen tip and the drawings you make.