Bear OPS Bear Song IV Butterfly Knife Carbon Fiber (4.38" Black) B-400-CF-B

MSRP: $209.99
Our Price: $134.95
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Item #BHQ-50069 Online Only


  • Overall Length:9.75"
  • Blade Length:4.375"
  • Blade Material:14C28N
  • Hardness:58-60 RC
  • Blade Style:Clip Point
  • Blade Grind:Hollow
  • Finish:Black
  • Edge Type:Plain
  • Handle Length:5.375"
  • Handle Material:Carbon Fiber
  • Color:Black
  • Weight:4.71 oz.
  • Knife Type:Butterfly
  • Brand:Bear Ops
  • Model:Bear Song IV
  • Model Number:B-400-CF-B
  • Country of Origin:USA
  • Best Use:Recreation
  • Product Type:Knife


This Bear Song IV butterfly knife represents the latest collaboration between BladeRunnerS (BRS) and Bear OPS. It is a lightweight flipper that is designed to be your go-to everyday carry knife. This B-400 model features carbon fiber handles, stainless steel spacers and a swappable latch. The pivots have 304 bearing surfaces and phosphorus bronze washers. The black finished stainless steel clip point blade has a double tang pin design for great performance.


Customer Reviews

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Not a bad beginner knife, but there were some problems.
Tyler S.
This knife is not a bad knife to start with if you are not sure whether or not balisongs are for you. The knife itself is made of decent quality materials, and the price is not too bad when it's on sale, which it almost always is. On mine, the handles popped off after about two days of extremely heavy flipping, and they were oddly enough not long enough to actually be screwed in. After ordering replacement screws, they were also too short to hold the handles in place. I got some longer screws from the hardware store, however, and the knife was perfect with loctite. Other than this one issue, the knife is great. The handles are a bit larger in diameter than, say, brs knifes, and the knife is not that heavy, but still heavy enough to comfortably do rollovers. The blade comes sharp, but not extremely so.
good knife if made right
Tony A.
my knife came with broken screws in the handle. had to replace them myself but still a good knife
Great knife
David G.
This is my second balisong knife and honestly I love it. The carbon fiber handles are heavenly, the stainless steel blade looks great as well and it flips really smoothly. The weight is just right it's also very nicely balanced only thing that I didn't like was that the blade wasn't as sharp as I'd like it to be and the tip of the blade wasn't sharpened evenly but that's nothing a little sharpening can fix. Other than that it's a really great knife.