Sert Braid X4 135m – Fluo Yellow – 0.16mm 20lb

Sert Braid X4 135m – Fluo Yellow – 0.16mm 20lb

Experience exceptional line control and ultimate bite detection with the Sert Braid X4 135m (Fluo Yellow – 0.16mm / 20lb). Meticulously engineered as an all-round casting master for both UK sea and freshwater predator fishing, this premium 4-strand braided mainline offers an unbeatable combination of an ultra-thin diameter, high abrasion resistance, and zero structural stretch.

Finished in high-visibility Fluo Yellow, this braid is the ultimate tool for situations where tracking the precise path of your line is critical—whether you are watching for subtle sideways line-ticks from a cruising bass in the coastal surf or controlling a soft plastic paddletail down a deep freshwater river glide for pike.

Technical Specifications

• Line Type: Premium 4-Strand (X4) High-Modulus Polyethylene (PE) Braid.

• Length: 135m / 150yds spool — ideal for filling standard 3000 and 4000-sized spinning reels.

• Diameter: 0.16mm — ultra-low profile for maximum aerodynamic efficiency.

• Breaking Strain: 20lb / 9.1kg — serious pulling power packed into a hair-thin line.

• Colour: High-Vis Fluo Yellow — perfect for low-light tracking, night fishing, and watching for slack-line bites.

• Stretch: Near-zero stretch for instantaneous hooksets and direct lure feedback.

Where to Use This Product

• Coastal Sea Bass Fishing: The ultra-slim 0.16mm profile cuts through harsh coastal headwinds like a knife, allowing you to cast metal jigs, surface sliders, and soft plastics massive distances into the surf.

• Lure Fishing for Pike & Zander: Perfect for working softbaits along the bottom of canals, drains, and rivers. The lack of stretch means you feel every gravel tick, weed bed, and tentative predator take instantly.

• Estuary & Rock Marks: The rugged 4-strand construction offers excellent structural integrity and superb abrasion resistance, giving you the edge when guiding hard-fighting fish away from sharp barnacles, kelp stalks, and submerged debris.

• Low-Light & Night Sessions: The vibrant Fluo Yellow colour tracks beautifully under a headlamp beam, letting you manage your line angles perfectly when working lures in pitch-black conditions.

Gerry’s Pro Tip: “A 4-strand braid like Sert X4 is fantastic for UK angling because the individual strands are slightly thicker than an 8-strand equivalent. This gives it a tougher, more rugged exterior that handles abrasive structures like rocks, weed, and canal pilings brilliantly. To get the absolute best performance out of this 20lb braid, always couple it with a 3 to 4ft leader of high-quality fluorocarbon or a wire trace. Use a reliable Albright or FG knot for the connection, and you’ll have a stealthy, rock-solid setup that casts like an absolute dream.”

Frequently Asked Questions

Will the Fluo Yellow colour spook the fish in clear water?

While the high-vis yellow is brilliant for the angler to track line movement above the surface, it can be visible to fish in crystal-clear water. To counter this, simply tie a 3ft to 5ft leader of invisible monofilament or fluorocarbon to the end of the braid. This gives you the best of both worlds: ultimate line visibility for you, and a completely stealthy presentation to the fish.

Does this braid require backing on the reel spool?

Because braid is incredibly thin and slick, it can spin on a bare metal spool under heavy load. We always recommend putting down a few wraps of standard monofilament backing on your spool first, or using electrical tape on the spool core, before tying and winding on your Sert braid. This gives the line something to bite into and prevents line slippage.

Can I use this line on a baitcasting reel?

Yes. The 0.16mm 20lb rating is highly versatile and performs exceptionally well on both modern fixed-spool spinning reels and low-profile baitcasting reels for freshwater predator work.