Nitecore NTP21 PenThe Nitecore NTP21 Pen is more than just a writing instrumentit's a multifunctional tool designed for both everyday use and emergency situations. Crafted from lightweight and durable aluminium alloy, the NTP21 offers ergonomic comfort for long writing sessions, even in extreme conditions, including underwater and in harsh climates. Equipped with a tungsten steel bezel, second only to diamond in hardness, the NTP21 doubles as a reliable glass breaker