Bear OPS Song IV Carbon Fiber Balisong Butterfly Knife - Satin Plain

Retail Price: $149.99
Our Price: $99.95
Out of Stock
Item #BP-13631


  • Overall Length:9.75"
  • Blade Length:4.375"
  • Blade Material:Sandvik 14C28N
  • Hardness:58-60 RC
  • Blade Style:Clip Point
  • Blade Grind:Hollow
  • Finish:Satin
  • Edge Type:Plain
  • Handle Length:5.375"
  • Handle Material:Aluminum
  • Color:Black
  • Weight:4.40 oz.
  • Knife Type:Butterfly
  • Brand:Bear Ops
  • Model:Bear Song IV
  • Model Number:B-400-AICF-S 35017
  • Country of Origin:USA
  • Best Use:Recreation
  • Product Type:Knife


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


Customer Reviews

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It is a nice looking knife
Michael G.
Bought this for my son-in-law to be. It is a nice looking knife, and flips well. I agree with the previous reviewer that the latch could be better designed.

The materials seem to be of decent quality and the blade is reasonably sharp out of the box. I was a bit disappointed with the grind--rather uneven. For close to a Benjamin, I expected a little better QC, to be honest.

No idea as to how this will hold up over the long run, but I suspect it will be fine.

If you like the look of CF (faux, CF, from what I understand) and like a US made product, I think you will be happy with this.
Hande Play!
Pyro D.
I loved this knife for 10 minutes. The I began to realize how much handle play there was. The latch at times would actually go over the edge of one of the handles, and stop me from opening or closing the knife. Very disappointing, Hoping it's just a lemon though.

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