All brass construction & Cerakote polymer coating for tactical, military, outdoor, space, automotive Premium, luxury pen offers durability, hardness & scratch-, corrosion-, heat-, chemical-resistance Pressurized thixotropic ink cartridges are hermetically sealed & write 3x longer than ballpoint pens Reliably performs in extreme temperatures (-50F to +250F), underwater, in zero gravity, at any angle Precision assembled & hand-tested with a lifetime guarantee against all manufacturing defects