"Getting the fish to bite comes first. What happens after the hookset—you can think about that later."
— Minoru Matsuda
Unmatched Softness. Our Softest Ever.
Sunline’s original softening technology, "DPP", takes leader design to a new level.
The ultimate bite performance—pursued for decades by master angler Minoru Matsuda
—has finally been realized through a groundbreaking approach:
applying targeted flexibility to specific sections of the line.
Experience the pinnacle of leader performance, crafted to satisfy even the most demanding genius.

The Ultimate Bite Performance, as Pursued by Minoru Matsuda.
One key factor is how quickly your rig settles and delivers the bait at the ideal angle to your target depth.
The other is achieving a natural presentation that allows fish to inhale the bait without sensing anything unnatural.
The all-new Black Stream brings these two ideals together
—perfect presentation and seamless intake—elevating performance beyond anything the original ever achieved.

Flexibility Technology of "BLACK STREAM KIWAMI"
While the standard BLACK STREAM (Plasma Rise®) offers a flexibility rating of 4 on a six-point scale, BLACK STREAM KIWAMI pushes the limits even further.
Powered by the patented DPP technology (Japanese Patent No. 6841410), the line alternates between two levels of flexibility (5 and 6) every 10 cm.
This unique structure creates micro pivot points at each boundary, allowing the line to bend more smoothly and naturally.
The result is a breakthrough in overall flexibility—a level of control and responsiveness that conventional lines simply cannot match.

Quick Adaptation. Flexibility That Triggers the Bite.
Among the many leaders available, the BLACK STREAM sits in the flexible category—but now, we’ve taken flexibility to the next level with BLACK STREAM KIWAMI.
With a flexibility index 12% higher than before, its supple feel surpasses what the numbers alone can convey.

Testing Method
RP Flexibility Test (Proprietary Testing Method)

Specimen Length 25.0 mm
Specimen Clamping Width 2.0 mm
Specimen Descent Distance 3.0 mm
Testing Speed 1.5 mm/second
Number of Measurements N=5
Flexibility Index (with BLACK STREAM conventional product as 100)
RP Value: Ratio of g/(mm⁴*mm⁴)