Slow-extruded in Japan
A controlled process helps keep the diameter uniform and the surface clean.
Big Game Series Ā· Slow-extruded in Japan
Opsin Big Game 150 lb Fluorocarbon Leader
1.18 mm Ā· 30 m and 110 m
At just 1.18 mm, Opsin 150 lb combines a thin diameter with the suppleness to let live bait swim more naturally. Slow-extruded in Japan for consistent diameter, dependable crimping, abrasion resistance, and strength you can trust when the leader comes tight.
Thin. Supple. Built to let the bait do its job.
Rigging note: Match sleeve and crimp cavity to the measured 1.18 mm diameter. Start by bench-testing a Diamond Silver Lock L or LL sleeve at 1.3 mm, then pull-test the complete system before fishing.
UV-blocking metallized bagProtects the coil from light exposure and storage abuse.
Developed in the U.S. Ā· Made in JapanBuilt around real offshore rigging needs and Japanese production.
No-BS supportTalk to someone who understands the line and how it fishes.
The material
Strength without unnecessary bulk
A clean leader starts with a clean extrusion. Opsin is run slowly in Japan to keep the diameter uniform and reduce the tiny surface defects that can turn into weak spots when the drag comes up.
The result is a 1.18 mm leader that stays manageable at the bench, seats predictably in the right sleeve, and gives a live bait room to work.
Thin by design
Less unnecessary bulk in the leader, with serious big-game capability.
Supple where it counts
Lets live bait move naturally instead of dragging a stiff leader through the water.
Built for clean rigging
Consistent diameter supports repeatable sleeve selection and crimp setup.
Field proof
Built for the part of the fight that matters
The bite is only the start. What matters is how the leader behaves after the fish turns, the drag settles in, and every connection has to keep doing its job.
Where 150 lb fits
Choose the leader for the job
150 lb is the clean middle ground for heavy tuna and versatile big-game rigging: thin enough to present a bait well, with the abrasion resistance and backbone to stay in the fight.
| Line class | Diameter | Best for |
|---|---|---|
| 100 lb | 0.93 mm | The thinnest Big Game profile for natural bait presentation and lighter drag |
| 130 lb | 1.06 mm | Finesse-minded heavy tackle and cleaner bait presentation |
| 150 lbYou are here | 1.18 mm | Heavy tuna and versatile big-game rigging |
| 170 lb | 1.28 mm | More abrasion margin and higher-drag applications |
| 200 lb | 1.44 mm | Heavy drag, bigger hardware, and more insurance when the leader gets rubbed |
| 250 lb | 1.57 mm | Heavy leader work where abrasion margin matters more than finesse |
| 300 lb | 1.84 mm | Maximum leader class for the heaviest tackle and highest-abrasion rigging |
Angler proof
Proven across the Opsin line
Real feedback from anglers fishing Opsin fluorocarbon from light leader to heavy offshore classes.
Opsin fluorocarbon customer reviews
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āUse Opsin from 2 to 180 lb. Trout to tuna. Works great, holds, stealth and gets bites when the bites are hard to come by.ā
Issac ParsellOpsin fluorocarbon
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āI use this product primarily for yellowtail and tuna. The product works great. Opsin has been my go to fluro for the past six years.ā
Robbie RobinsonYellowtail and tuna
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ā50lb opsin is the bomb. You can really pull with confidence and it paid off for me on my 8 day trip on the Indy!! 104lbs!ā
Ned Nakatsuka8-day trip Ā· 104 lb fish
Verified customer reviewRigging notes
Crimp it like the whole system matters
What sleeve should I use with Opsin 150 lb?
Size the sleeve to the measured diameter, not the pound-test. Opsin 150 lb is 1.18 mm. Diamondās published guides place both the 1.3 mm L and LL Silver Lock sleeves across diameter ranges that include 1.18 mm.
Use the L as the first bench test and LL as the alternate. Match the exact sleeve to its specified crimper cavity and pull-test the finished leader.
Diamond Silver Lock L Ā· 1.3 mm
Diamond publishes the L sleeve for 0.95ā1.3 mm mono or fluorocarbon in its Mini-Press guide. At 1.18 mm, it is a clean documented starting point.
Diamond Silver Lock LL Ā· 1.3 mm
Diamond publishes the LL sleeve for 1.1ā1.4 mm mono or fluorocarbon in its Mini-Press guide. Treat it as a separate setup and reset the tool before testing.
Deckhand note: Sleeve fit matters more than the number printed on the package. If it takes force to thread, stop. If the leader swims inside the sleeve before crimping, the fit is too loose. Test the exact leader, sleeve, tool, and pressure you plan to fish.
Should I choose 30 m or 110 m?
The 30 m coil is the clean choice for a trip bag or a handful of leaders. The 110 m crew coil drops the cost per metre and makes sense when you rig often, carry backups, or prep for a full season.
I rig Seaguar Premier 150 lb. Where should I start?
Seaguar Big Game Fluoro Premier 150 lb is listed at 1.15 mm, so the same 1.3 mm sleeve class is a logical starting point for Opsin at 1.18 mm. Do not assume the same compression setting. Reset the crimper for the exact sleeve and leader, then pull-test the finished rig.
How should I store the coil?
Keep it clean, dry, and out of prolonged light and heat. Return the coil to the UV-blocking metallized bag between trips and avoid kinking it under hard tackle.
Opsin Big Game Ā· 150 lb Ā· 1.18 mm
Rig it clean. Stay on the fish.
150 lb Ā· 30 m Ā· $79.99
