When Grzegorz Grabarski designs a knife, you expect precision. When Bestech builds it, you expect quality. The SENU series takes both to the next level by offering four distinct interpretations of the same high-performance EDC platform. I've spent the last month carrying and cutting with the BT2601A, BT2601B, BT2601C, and BT2601D, and I've come to appreciate that the "best" one isn't about specs—it's about how the handle feels in your hand and how the blade catches your eye. Here is my honest, hands-on comparison of these four premium folders.
BT2601A (Ultem Inlay): The Understated Workhorse
The BT2601A is the purist's choice. It pairs a stonewashed titanium handle with translucent Ultem inlays. Ultem is a high-heat resistant polymer that offers a unique, amber-like glow without the weight. In hand, the texture is slightly grippier than carbon fiber, making it ideal for wet or gritty conditions. The bead blast and satin blade finish is classic and easy to maintain. If you want a tool that looks great, performs flawlessly, and doesn't scream for attention, the A variant is your silent partner. It’s the one I grab for outdoor work where reliability matters more than flash.
BT2601B (Marble Carbon Inlay): The Tactical Gentleman
Step up to the BT2601B, and you're entering a different league. The handle features marble carbon fiber inlays set into a grey PVD-coated titanium frame. The marble pattern is subtle but mesmerizing, shifting in the light like liquid stone. The blade is finished in a complementary stonewash and satin that resists scratches. This knife balances ruggedness with sophistication. It’s the one I carry to the office or when I want my EDC to spark a conversation without being ostentatious. The grey PVD also adds an extra layer of corrosion resistance.
BT2601C (Fat Carbon Inlay): The Art Collector's Dream
The BT2601C is where materials become art. The handles are bronze-anodized titanium with stunning Fat Carbon inlays. Fat Carbon is a forged carbon composite with a chaotic, three-dimensional weave that catches light from every angle. But the real showstopper is the blade: a horizontal satin finish applied by hand. Each scratch mark is deliberate, giving the blade a bespoke, jewel-like quality. This is the most expensive of the quartet, and for good reason. It’s a collector's piece that you'll actually want to use—the ceramic ball bearing pivot ensures deployment is as smooth as the looks.
BT2601D (Camo Carbon Inlay): The Stealth Operator
Finally, the BT2601D goes dark—literally. Both the titanium handle and blade receive a black PVD coating, making the knife nearly non-reflective. The camo carbon fiber inlays add a tactical twist without being loud. In practice, this coating is incredibly durable; after weeks of breaking down boxes, there are no visible marks. If you prefer your gear low-visibility and ready for anything, the D variant is your companion. It's the lightest in visual weight but carries the same CPM-S90V core as the others, ensuring it performs just as hard.
The Verdict: Choose Your Character
All four SENU models share the same outstanding DNA: a 3.48" CPM-S90V blade (61-63 HRC), a titanium frame lock, ceramic bearings, and a perfect 108g weight. The decision comes down to personality. The BT2601A is the reliable, grippy workhorse. The BT2601B is the refined tactical piece. The BT2601C is the collectible art knife. And the BT2601D is the stealth operative. Personally, I find myself drawn to the C for its hand-finished blade and mesmerizing Fat Carbon, but I respect the A for its no-nonsense durability. Whichever you choose, you're getting a premium EDC knife that will last a lifetime.
Quick Reference: SENU Personalities
BT2601A (Ultem): Best grip, translucent inlays, satin blade – the utilitarian.
BT2601B (Marble Carbon/Grey PVD): Sophisticated, scratch-resistant, office-friendly.
BT2601C (Fat Carbon/Bronze): Hand-polished blade, artistic inlay, the collector's grail.
BT2601D (Camo Carbon/Black PVD): Fully coated, stealthy, maximum corrosion resistance.
