Ballpoint pen knife

A ballpoint pen knife is a multi-tool pocket knife consisting of a blade concealed inside an ordinary-looking ballpoint pen. The blade, typically 51 to 127 millimetres (2.0 to 5.0 in) in length, is usually hidden. They first appeared as custom-made pens from various custom knife makers before being mass-produced by production companies.

A common ballpoint pen knife with a concealed blade (top), and an unsheathed blade (bottom).

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.

A knife of this type can be used as a standard letter or package opener. The knife can also be used for cleaning fingernails, peeling fruit and vegetables, cutting meat, and carving or shaping wood. They come in many versions, including variants with special purpose razors for shaving.

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 sheath. Common blades may be the single-edged thrusting type or the double-edged dagger type, or even an unsharpened stiletto type point that can only thrust, not cut. Blades can be razor-sharp or deeply serrated for use in a range of situations. Swiss Army Spectrum Series released their S.A.S.S. Ballpoints, which look and function like regular ballpoint pens. They come with an array of foldaway blades and tools including knife, scissors, file, opener, screwdriver and battery-powered light.

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.

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References

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Knives and daggers
List of daggers List of blade materials
Types of knives	Aircrew Survival Egress Knife Athame Balisong/Butterfly Ballistic Ballpoint pen knife Bayonet Boline Bolo Boning Boot knife Bowie Bread knife Cane knife Ceramic knife Cheese knife Chef's knife Cleaver Clip point Combat knife Commander Corvo CQC-6 Deba bōchō Diving knife Drop point Electric knife Fairbairn–Sykes fighting knife Gerber Mark II Ginsu Golok Grapefruit knife Gravity knife Guna Hunting knife Jacob's ladder Karambit Kard Kīla Kirpan Kitchen knife Kukri Laguiole knife Machete Mandau Mezzaluna Misericorde Mora knife Multi-tool Nakiri bōchō Navaja Neck knife Nontron knife Opinel knife Palette knife Pantographic knife Parang Penknife Penny knife Pirah Pocketknife Putty knife Puukko Rampuri Resolza Sabatier Sami knife Santoku SARK Scalpel Seax Sgian dubh Sharpfinger Shiv Sliding knife Smatchet SOG Knife Straight razor Strider SMF Survival knife Swiss Army knife Switchblade Taping knife Throwing knife Tomato knife Trench knife Tumi Ulu Utility knife Warrior knife X-Acto Yanagi ba Yatagan
Types of daggers	Anelace Applegate–Fairbairn fighting knife Arkansas toothpick BC-41 Bagh nakh Balarao Baselard Bichuwa Bollock dagger Cinquedea Dirk Ear dagger Emeici Facón French Nail Gunong Hunting dagger Janbiya Jile Kabutowari Kaiken Kalis Katar Khanjali Khanjar Kris Kunai Mark I trench knife Parrying dagger Poignard Push dagger Rondel dagger Seme Shobo Sica Stiletto Marine Raider V-42 Tantō Yarará Parachute Knife Yoroi-dōshi
Knife manufacturers	Aitor Knife Company Al Mar Knives American Tomahawk Company Aritsugu Benchmade Böker Buck Knives Camillus Cutlery Company Cattaraugus Cutlery Company Chris Reeve Knives CHROMA Cnife Clauss Cutlery Company Cold Steel Columbia River Knife & Tool Cuisinart Cutco Dalian Hanwei Metal Dexter-Russell DOVO Solingen Due Ancore Ek Commando Knife Co. EKA Emerson Knives F. Dick Fällkniven FAMAE Fiskars Gerber Legendary Blades Füritechnics Glock Ges.m.b.H. Imperial Schrade Ka-Bar Kershaw Knives KitchenAid Korin Japanese Trading Company Kyocera Leatherman Mad Dog Knives Marble Arms Medford Knife and Tool Microtech Knives Morseth Muela Murphy Knives Olfa Ontario Knife Company Opinel Randall Made Knives Rösle Sabatier Shun Cutlery Slice, Inc. SOG Specialty Knives Spyderco STI Knives Strider Knives Thiers Issard TOPS Knives Tramontina Victorinox W. R. Case & Sons Cutlery Co. Carl Walther GmbH Wenger Western Knife Company Wilkinson Sword Wüsthof Yoshida Metal Industry Global Zero Tolerance Knives Zwilling J. A. Henckels
Knifemakers	Rex Applegate James Black Blackie Collins John Nelson Cooper Ernest Emerson Jerry Fisk Bill Harsey Jr. Phill Hartsfield Gil Hibben Jimmy Lile Bob Loveless William F. Moran Ken Onion Ralph Osterhout Bo Randall Chris Reeve A. G. Russell Jody Samson William Scagel Mike Snody Robert Terzuola Michael Walker Buster Warenski Daniel Winkler
Associations	American Bladesmith Society Cutlery and Allied Trades Research Association Knifemakers' Guild
Book:Knives and daggers Category:Knives / Daggers

Pens
Types	Active Ballpoint Brush Demonstrator Digital Dip Fountain Gel Ink brush Light Marker dry erase highlighter paint permanent UV Qalam Quill Rastrum Reed Rollerball Ruling Skin Stylus Technical (rapidograph)
Parts and tools	Blotting paper Ink blotter Inkwell Nib flex nib Penknife Pounce
Inks	Alizarine Fountain pen India Iron gall Stark's
Other	Ballpoint pen artwork Ballpoint pen knife Counterfeit banknote Birmingham pen trade Pen Museum Kalamos Pen computing Penmanship Pen painting Pen spinning Retipping
Related	Calligraphy Cartooning Comics Lettering Pencil mechanical pencil Narayam
List of pen types, brands and companies