Seaguar Inshore Fluorocarbon Fishing Leader
- Line Weight: 40 lb
- Size: 40 pounds
- Color: Clear
- Item Weight: 0.2 pounds
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A fluorocarbon line from an established maker, worth considering for leader or mainline use where low visibility and low stretch matter more than line cost.
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ASIN: B08KGXPF17Model: 40IS100Category: Fluorocarbon Fishing Lines
Overview
Seaguar's 40IS100 is a fluorocarbon fishing line, sold under a model code that points to roughly a 40 lb test class spool. Fluorocarbon lines like this are chosen by anglers who want a leader or main line that all but disappears underwater.
Fluorocarbon differs from monofilament and braid in a few concrete ways: it has a refractive index close to water, so it is far less visible below the surface, it sinks rather than floats, and it stretches less than mono, which telegraphs strikes more directly. Seaguar is one of the longer-running fluorocarbon makers in the US market, which matters for buyers who care about consistent spool quality from batch to batch.
- Fluorocarbon line construction
- Model code suggests 40 lb class
- Sinking, low-stretch profile
- Made by Seaguar
Who it's for
This suits anglers targeting line-shy fish in clear water, bass anglers running finesse rigs, and anyone building fluorocarbon leaders for spinning or casting reels. It is not the pick for topwater fishing, where a floating, visible line helps track the lure.
Pros and cons
- Sinks for subsurface presentations
- Low stretch aids hookset
- Near invisible to fish underwater
- From an established fluorocarbon maker
- Listing omits exact pound test and diameter
- Stiffer to handle than monofilament
- No stated spool length
Performance notes
Fluorocarbon's density means this line sinks, which helps keep lures and baits down in the strike zone without added weight. Its stiffness compared to mono also gives it stronger abrasion resistance against rocks, shells and structure, though that same stiffness can make it less forgiving to cast on ultralight spinning gear if the diameter is on the heavier side.
Specifications
| Brand | Seaguar |
|---|---|
| Model | 40IS100 |
| Dimensions & fit | |
| Line Weight | 40 lbhigher than 89% of 39 fluorocarbon fishing lines |
| Size | 40 pounds |
| Item Weight | 0.2 poundshigher than 83% of 24 fluorocarbon fishing lines |
| Item Length | 0.1 yards |
| Construction & materials | |
| Color | Clear |
| Material Type | Fluorocarbon |
| Included components | |
| Unit Count | 300 feet |
| Number Of Packs | 1 |
| Included Components | 1 Spool Of Fishing Line |
| Warranty & support | |
| Warranty Description | Limited |
| Other details | |
| Fishing Line Type | Fluorocarbon |
| Strand Type | Single |
| Number Of Items | 1 |
| Breaking Strength | 40 pounds |
| Item Type Name | 100% Fluorocarbon Leader |
Closest rivals on specs
P-Line Salmon Steelhead Select Fluorocarbon Leader 100 Yd- Item Weight 0.2 vs 0.15 pounds (+33%)
VARIVAS 21087 Fluorocarbon Fishing Line- Line Weight 40 vs 50 lb (-20%)
- Size 40 vs 50 pounds (-20%)
Reaction Tackle Pure Fluorocarbon Fishing Line- Line Weight 40 vs 30 lb (+33%)
- Size 40 vs 30 pounds (+33%)
Frequently asked questions
What is the Seaguar 40IS100 line made of?
It is a fluorocarbon fishing line, not monofilament or braid, based on the product title and category listing.
Does fluorocarbon line float or sink?
Fluorocarbon is denser than water, so it sinks, unlike standard monofilament which floats.
Is this line more or less visible underwater than mono?
Fluorocarbon has a refractive index close to water, which makes it substantially less visible underwater than monofilament.