DUO Beach Walker Flipper iTMB33: Reading the Specs on DUO’s New Surf Blade

Note before you read: this lure is a September 2026 release and I have not had one in my hand yet. Everything below is read off the published specification and off using the other Flippers, not from fishing this one. I will add a proper impression once I have used it. The photo at the top of this page is the Flipper iT38, the closest sibling to the iTMB33 – it will be swapped for the real thing when I have one.

DUO’s Beach Walker Flipper is one of the few Japanese surf lures that has genuinely crossed over – if you fish sand anywhere, someone near you owns one. The new Flipper iTMB33 is interesting because the name tells you exactly what DUO did, if you know how to read it.

The name is the spec sheet

DUO has two existing modifiers in the Flipper range. iT means tungsten is built in. MB means a rear blade. The iTMB33 is both of them in one body at 33 g: a tungsten-weighted, blade-equipped Flipper. That is the whole design brief in four characters.

Specification

How it compares with the rest of the Flipper family

Two numbers stand out. The iTMB33 is about 11 mm shorter than the Flipper 32 at almost the same weight – that is the tungsten doing its job, packing the same mass into a smaller silhouette. And the blade is roughly 2.5 times the size of the blade on the MB22, so this is not simply a bigger MB22; the appeal has been scaled up more than the body has.

What the numbers suggest about how it fishes

• A small profile at a heavy weight. 33 g in a 59 mm body means you can cast into wind and still show fish something bait-sized. That is exactly the situation that beats most surf lures: strong onshore wind, small bait.
• The blade does the work at low speed. A large blade on a short body gives you flash and vibration at retrieve speeds where a plain jig would be doing nothing. DUO’s own description of how to fish it is simple – cast a long way and keep winding all the way back, because fish follow from out wide and eat at your feet.
• The hook layout is built for that. A single front hook with the blade at the rear keeps the lure from fouling on the retrieve and keeps the hook point where a flatfish, which eats from below and behind, actually contacts it.

Where it should fit in a box that already has Flippers

If you already own the 32 and the MB22, the iTMB33 is not filling a gap in weight – it is filling a gap in appeal at a given weight. That is a narrower reason to buy, but on the days it matches, it matters.

The wider trend worth noticing

Autumn 2026 has a pattern to it. DUO has gone heavier-bodied and blade-forward with this Flipper; Shimano’s new Hikage 125S has a body around 1.6 times the wall thickness of the Silent Assassin series. Japanese makers appear to be attacking the assumption that plugs are the fragile option in a surf box. If you fish where big pelagics and structure both exist, that is a good trend.

What I still want to know

• Whether the short body costs casting distance against the iT38 in a real headwind.
• How the blade behaves on a very slow retrieve – whether it keeps turning at flatfish speed.
• Whether the #7 front hook is enough for a big pelagic, or whether it needs upgrading.

I will update this page once the lure has been through a few sessions.

Read next

• Japanese metal jigs for shore fishing: 9 I actually use
• Japanese surf rods compared by price range
• Rapala CrushCity Infiltrator review
• Japanese PE line sizes and leader pairings
• DUO Beach Walker Haul review: Japan’s default flounder lure
• Five lures for Japanese flounder from the beach

MINAGIMAN

JAPAN ANGLER

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Born in 1994. Originally from Hyogo Prefecture, I moved to Iwata City in Shizuoka Prefecture in search of the sea. I am an Enshunada surf angler who enjoys surf fishing. I am also active on YouTube, and my fishing grounds range from Irago to Iwata.