友人が使いながら「コレいいよー」と見せてくれたのがSLIP-ONが作っている
SIERRAというペン。パッと見はシャープペンなのにソフトインクのボールペンです。ボディに鉛筆の木軸が使われているところがカワイイ。0.2mmと極細ですが、なんともスムーズな書き心地。いろんな色のボディ（インクは黒のみ）や
短いサイズもあるみたいです。で、年季の入った使いかけのペンを友人からもらって帰ってきました。どうもです。
My friend showed me his ballpoint pen
SIERRA, which is made by a Japanese company called SLIP-ON, and he strongly recommended the pen to me. It looked like a propelling pencil but it is a ballpoint pen. I like that the body part is made of a classic pencil's wood. The pen thickness is only 0.2mm, and it is so smooth. There are lots of colour variations for body parts (ink is black only) and also
shorter version. His pen seemed like he had been using for a long time, but he gave it to me. Thanks.
