The Sheafferﾮ Sentinel Collection slim profile pens provide writing quality with a click of a button. Perfect for the professional or for practical everyday usage, it fits into almost any portfolio and pocket calendar. Available in ballpoint pen or 0.7mm mechanical pencil, Sentinel is a reliable writing instrument that comes at an affordable price. The Mechanical pencil and ballpoint pen's one-handed push button activation is convenient, durable, dependable.