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Our entire team at Gerry’s are all experienced anglers and can help you choose the correct tackle for any fishing situation. Please drop us a message or give us a call if you need any help.
You can return unused standard items within 30 days for exchange or refund.
We check our prices weekly to ensure we can combine our fabulous service with the best prices. If you find an item cheaper and in stock somewhere else, drop us a a message in the chat box and we can see what we can do.
This item is available for next day delivery. You can pick this in the checkout.
We offer free post to any mainland UK address with a basket of more than £80. We also send all over the world and the best way to find out how much postage you will pay is in our checkout. Add the items to your basket and then add your address. Our checkout will automatically calculate your total.
We have come from a tiny fishing store and grown into one of the biggest fishing tackle retailers in the UK winning countless awards over the years. We are still a family business offer fabulous service online and in-store.
Spread the cost of larger orders over 6 or 12 month 0% APR. We also offer longer terms with APR charges via V12 finance. Available in the checkout.
You can make your next purchase a little easier on the wallet by splitting the total into 3 payments by using Klarna payments in the checkout.
The Duo Onimasu Masakage Slim 120F is a “technical evolution” in the Masakage series, offering a “slender shape compared to the Onimasu Masakage 110F.” At Gerry’s Fishing, we recommend this model for anglers who require a “finesse” approach in clear water or high-pressure environments. By stretching the profile to 12cm while maintaining a lightweight 10g body, Duo has created a lure that “experiences reduced water resistance for an even more natural swim.“
Despite its delicate appearance, it “maintains superb stability against the most robust currents,” making it a “must-have” for both “specimen trout” in large rivers and Bass or Sea Trout in shallow coastal waters.
Reduced Resistance Profile: The “slender shape” allows the lure to cut through the water with minimal drag. This results in a “fluid” and subtle action that mimics the “natural” movement of a long, thin baitfish like a sandeel or a minnow.
Maximized Casting Performance: Duo has engineered the body shape to “maximize casting distances by minimizing air resistance.” Even at 10g, its “streamlined” design ensures it flies straight and true, allowing you to reach “distant positions” without the lure tumbling.
Stability in Robust Currents: The internal balance is tuned so that the 120F “responds well to dynamic animations” even in “strong currents.” It won’t “blow out” or spin, staying “locked in” the strike zone during fast-water glides.
Floating Buoyancy: As a “floating” jerkbait, it offers the “technical edge” of being able to pause the retrieve and let the lure rise away from submerged snags or weed beds.
| Feature | Details |
| Model | Duo Onimasu Masakage Slim 120F |
| Length | 120mm (12cm) |
| Weight | 10g |
| Type | Floating (F) |
| Action | Natural Slender Wobble / High-Response Jerk |
| Target Species | Large Trout, Salmon, Bass, and Sea Trout |
| Environment | Large Rivers, Shallow Bays, and Estuaries |
The Masakage Slim 120F is a “precision tool” for the thinking angler. The Gerry’s team suggests:
The “Dynamic Animation” Strike: This lure “responds well” to sharp rod twitches. Because it has “reduced water resistance,” it darts laterally with very little effort, creating a “flash” that is “essential in warding off predators” and triggering a strike.
Shallow Water Stealth: Its “slender profile” and floating nature make it “ideal for exploring” shallow rocky areas or weed-rich estuaries. With the “rod in a high position,” you can make it “swim just below the surface.”
Matching the Hatch: The 12cm length is an “absolute reference” when predators are keyed into long, thin prey. It perfectly “mimics a sandeel” or a juvenile lamprey moving through the current.
The Dead-Drift Technique: In “robust currents,” cast up-and-across and let the lure “drift” with the flow, using only minor reel turns. The “natural swim” will do the work for you as the lure swings through the arc.
Gerry’s Verdict:
The Duo Onimasu Masakage Slim 120F (12cm/10g) is a “top-tier” Japanese finesse lure that balances a “slender shape” with “superb stability.” It solves the problem of “unnatural” lure movement in clear water by providing a “fluid” and “natural swim.” For the angler who values “subtlety and precision,” this is a high-value investment
Our entire team at Gerry’s are all experienced anglers and can help you choose the correct tackle for any fishing situation. Please drop us a message or give us a call if you need any help.
You can return unused standard items within 30 days for exchange or refund.
We check our prices weekly to ensure we can combine our fabulous service with the best prices. If you find an item cheaper and in stock somewhere else, drop us a a message in the chat box and we can see what we can do.
This item is available for next day delivery. You can pick this in the checkout.
We offer free post to any mainland UK address with a basket of more than £80. We also send all over the world and the best way to find out how much postage you will pay is in our checkout. Add the items to your basket and then add your address. Our checkout will automatically calculate your total.
We have come from a tiny fishing store and grown into one of the biggest fishing tackle retailers in the UK winning countless awards over the years. We are still a family business offer fabulous service online and in-store.
Spread the cost of larger orders over 6 or 12 month 0% APR. We also offer longer terms with APR charges via V12 finance. Available in the checkout.
You can make your next purchase a little easier on the wallet by splitting the total into 3 payments by using Klarna payments in the checkout.




Penn Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
Wader Waist Guide
Small (28″-30″)
Medium (30″-33″)
Large (34″-37″)
XLarge (37″-39″)
XXLarge (39″-42″)
3XLarge (42″-45″)
Kinetic/Westin Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
3XLarge (54″-56″)
Grundens Chest Size Guide
Small (36″-37″)
Medium (38″-40″)
Large (42″-44″)
XLarge (46″-48″)
XXLarge (50″-52″)
3XLarge (54″-56″)
Vass Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Trakker Chest Size Guide
Small (38-40″)
Medium (41-43″)
Large (44-46″)
Xlarge (47-49″)
XXLarge (50-52″)
XXXLarge (53-55″)
Korda Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Guy Cotten Chest Size Guide
Small (86 – 94cm)
Medium (94 – 102cm)
Large (102 – 110cm)
XLarge (110 – 124cm)
XXLarge (124 – 134cm)
3XLarge (134 – 154cm)
Fox Chest Size Guide
Small (36″-38″)
Medium (39″-41″)
Large (42″-44″)
XLarge (45″-47″)
XXLarge (48″-50″)
3XLarge (51″-54″)
4XLarge (55″-60″)
Nash Chest Size Guide
Small (36″-38″)
Medium (39″-41″)
Large (42″-44″)
XLarge (45″-47″)
XXLarge (48″-50″)
3XLarge (51″-54″)
4XLarge (55″-60″)
Aqua Chest Size Guide
Small (38-40″)
Medium (41-43″)
Large (44-46″)
Xlarge (47-49″)
XXLarge (50-52″)
XXXLarge (53-55″)
Guru Chest Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Preston Chest Innovations Size Guide
Small (36″-38″)
Medium (38″-41″)
Large (42″-44″)
XLarge (45″-46″)
XXLarge (47″-48″)
3XLarge (49″-51″)
Trouser Waist Guide (Inches)
Small – 28″ – 32″
Medium 32″ – 34″
Large – 34″ – 36″
X-Large 36″ – 38″
XX-Large – 38″ – 42″
XXX-Large 42″ – 46″
XXXX-Large 46″ – 52″