Ballpoint pen knife
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A ballpoint pen knife is a
Uses
Pen knives such as these are designed for self-defense due to their ease of concealment. Their small size renders them impractical as weapons in elaborate combat, but their slim profile allows them to cause great harm in close-range combat with an element of surprise. [citation needed]
A knife of this type can be used as a standard
Kinds of blades
All ballpoint pen knives come with straight blades, which are easier to conceal than curved blades. These 51-to-127-millimetre (2.0 to 5.0 in) blades are fixed to the topmost part of the pen, hidden inside a hollow cap, serving as both the pen's end and the knife's
Legality
Ballpoint pen knives, because they allow a knife to be disguised as an innocuous object, are subject to restrictions or prohibitions in some jurisdictions. For example, in North America they are not available for sale in California or Canada.