C131 Terzuola Slipit

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The C131 Terzuola Slipit was introduced in 2009. The C131 is the first Spyderco model featuring the Ball Joint non-locking mechanism.

Appearance in catalogs

The C131 Terzuola Slipit appeared in the following catalog:

  • 2009 Spyderco Mid-Year Product Guide Supplement


Robert "Bob" Terzuola, a custom knife maker in USA.

Bob Terzuola Makers mark

History, mentionings from the forums etc.

Spyderco forums:

Information from the Spyderco catalog on the web

"You see interesting knives and equally interesting people when walking the aisles of a knife show. Small by business standards and specialized in nature, the cutlery industry has names everyone knows. One is Bob Terzuola, we call him Bob T. Bob’s made handmade knives since the 1970s, has collaborated with the top production companies and acknowledged as the founder of tactical knifemaking. In our small industry he’s rock star. His designs are clean, militaristic, finely polished and perceived as having a high-level of performance and physical appearance. His fourth collaboration with Spyderco is the Bob T SLIPIT.

SLIPITS are a new benchmark in knives, non-locking one-hand open folders with pocket clips. Bob T’s SLIPIT has a CMP-S30V modified Wharncliff blade that to close must overcome the resistance of a small ball bearing. Bob calls this a Ball Joint non-locking system; he’s developed and refined on many custom pieces for close to a decade. The Ball Joint also half-stops the blade when closing for safety. Behind the cutting edge he placed a finger choil/guard keeping the index finger away from the open blade and keeping the blade from closing on the hand when cutting. He also made the blade under three inches keeping it legal in most jurisdictions and countries (England and Germany to name a couple) for carry anywhere. Carbon fiber handle and backspacer make this carry friendly SLIPIT both hi-tech and luxurious. Left/right pocket clip is nested in its’ mounting and won’t pivot or loosen. A folded leather lanyard comes with it, tied off with a silver crimp." [1]


The C131 Terzuola Slipit is made in Taiwan and has a

SKU Handle Edge(s) Steel From/To MSRP Note Number made Grind Clip Clip positions Collectors club
C131CFP Black twill CF PE CPM-S30V 2009-2011 159.95$ (2009) N/A Hollow 2-screw Metal LH/RH, TU Main

Most collectible variation

Questions regarding collecting the C131

Some interesting questions we are looking for an answer to:

Questions with an answer:

Technical information

Measurements (mm and grams) of the C131 Terzuola Slipit:

Variation Length overall Length closed Length blade Length edge Hole Ø Blade thickness Weight
C131CFP 177mm 101mm 76mm 68mm 11mm 2.5mm 70g

Measurements (inches and ounces) of the C131 Terzuola Slipit:

Variation Length overall Length closed Length blade Length edge Hole Ø Blade thickness Weight
C131CFP 7" 4" 3" 2 11/16" 7/16" 3/32" 2.5oz


  1. The C131 Terzuola Slipit in Spyderco's online catalog


Related Articles


The Bob Terzuola Slipit with accessories (Surefire E1B flashlight and Tissot Watch)
The Terzuola Slipit closed, with 'friends'.