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Product guide

Daiwa J-Braid x4 JB4U15-300DG, 15 lb, 300 yd

JB4U15-300DG: Daiwa J-Braid x4 is a dark-green, four-strand braided fishing line sold on a 300-yard filler spool. Its listed 15-pound test and polyethylene material suit anglers choosing a specific line strength and spool length, but the listed diameter is inconsistent.

At a glance

  • Four-carrier Dyneema braid, described as a 4-strand construction.
  • 300-yard filler spool in dark green.
  • Listed as 15-pound test.
Price
$20.30Save 15%

Reference price: $23.99

Price checked: Nov 14, 2026

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Often bought together

Pros and cons

Pros

  • A 300-yard spool provides a substantial length for filling or refreshing a reel.
  • The four-strand construction and 15-pound test are specified for buyers comparing line build and strength.

Technical specifications

11 specifications
Identity
BrandDaiwa
ModelJB4U15-300DG
Line typeBraided
Strand construction4-strand
Line weight15 pounds
Length300 yard
ColorDARK GREEN
Materials and protection
MaterialPolyethylene
Dimensions and installation
Weight listed2.24 ounces
Other listed details
Diameter in product features0.008 diameter
Line size in details0.01 inches

What to know before buying

Listing details to confirm

The listing gives two different diameter figures: 0.008 diameter in the feature text and 0.01 inches in the line-size details. Confirm which diameter applies to the selected spool before buying. The manufacturer also describes the braid as four-carrier Dyneema while the material field says polyethylene.

What’s in the box

Included
  • 300 yards of fishing line

Who is it for?

A good fit for

  • Anglers seeking a dark-green braided line in a 15-pound test and 300-yard spool.
  • Buyers who want a four-strand braid and can confirm the line diameter they need.

Less suited to

  • Buyers who require a confirmed, unambiguous line diameter before choosing a line.
Daiwa J-Braid x4 JB4U15-300DG, 15 lb, 300 yd · photo 2
Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 21 ratings
  • 5 stars63%63%
  • 4 stars23%23%
  • 3 stars0%0%
  • 2 stars0%0%
  • 1 star14%14%

Aggregate ratings lean positive, with most ratings in the four- or five-star categories, but a smaller one-star share shows that experiences are not uniformly favorable. With no review comments supplied, the ratings do not explain what customers liked or disliked. They cannot establish how this line performs for a particular reel or fishing use.

Frequently asked questions

How long is this spool?

The listed length is 300 yards.

What is the listed line strength?

The details and feature text identify it as 15 pounds or 15-pound test.

What diameter is the line?

The listing is inconsistent. Feature text says 0.008 diameter, while the line-size field says 0.01 inches. Confirm the applicable figure before purchase.

What does x4 refer to?

The listing describes the line as a four-carrier braid and identifies its strand type as 4-strand.

Daiwa J-Braid x4 JB4U15-300DG, 15 lb, 300 yd · photo 3
Additional product photo 3

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