The business world is a jungle nowadays. Here is your survival kit. Two in one: ballpoint pen and mechanical pencil in a single writing instrument that takes care of all your writing needs.. The LAMY twin pen is as practical as it's good looking. Why choose one when you can have it all? Cylindrical body with sprung, axle mounted clip made of solid stainless steel with Matte black lacquer finish. Fitted with ballpoint pen refill LAMY M 21 black and pencil lead 0.5 (LAMY M 41) HB. With system identification ring and built-in eraser (LAMY Z 15) underneath the removable button.