Bear OPS Bear-Song IV Butterfly Knife Black Aluminum (4.38" Satin Plain) B-400-S

MSRP: $128.50
Our Price: $84.95
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Item #BHQ-16205


  • 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
  • Model:Bear Song IV
  • Model Number:B-400-ALBK-S
  • Country of Origin:USA
  • Best Use:Recreation
  • Product Type:Knife


The Bear Song IV butterfly knife is a collaboration between BladeRunnerS (BRS) and Bear OPS. It is a lightweight flipper that is designed to be your go-to everyday carry knife. The B-400 model features black finished aluminum handles with stainless steel spacers and a swappable latch. The pivots have 304 bearing surfaces and phosphorus bronze washers. The satin finished 14C28N stainless steel clip point blade has a double tang pin design for great performance.


Customer Reviews

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For the Money, I'd recommend
Damonie C.
fantastic beginner/casual knife, good feel and good quality. And affordable price. It's a very good knife all around, great design.

The downsides for me are at the bottom of the knife.
The latch wont stay closed in the closed position very effectively, and after minimal amounts of flipping, the bottom end of my safe handle looks like its been smashed against the floor repeatedly. cant win them all for a bali-song at this price, though.

I wouldn't hesitate buying it again.
great mid-range balisong for a song
Nicolas M.
I think this knife is awesome, all things considered. For the price, it is a solid deal. The weighted handles are great for flipping, as it puts the main weight at the end of the handles in the spacers. This is an excellent beginner balisong, or for learning to do flips or juggling. FYI it is pretty big, so not an edc, though not MANY balis fit the bill of edc. Thanks bladehq, and keep up the great work BRS/Bear ops