Outdoor Mini Stainless Steel 0.5mm Black Refill Ball-Point Pen with Tungsten Steel Head & Keyring can be used for self-defense or to break glass. Stainless steel casing ensures its solid structure and high strength. With special treatment at the handle, it is easy to grip on hands and also comfortable to use. Designed into pen style, it is portable for daily carry and use. With excellent tactical performance, it will well protect you from danger. Wanna buy one for your own use?