Upsie leader FC with the strongest knot performance. α1+ special manufacturing methods make it nearly 1.3 times stronger and slimmer by about 5% of the thread diameter than our previous products. Strong! ] With very little error in diameter, it has a flexible yet strong stability and excellent surface smoothness. Even in high tension long fights it demonstrates resilience without the line breakage, and an astonishing toughness ensures that you will be able to get the big one in your hand. V10 SOFT (Soft Type): Recommended for nylon swimming lures and sucking methods. V12 HARD (Hard Type): Recommended for when a tight approach to bottom contact structure becomes a method.