The BIOMASTER Iso, with specifications almost identical to the BBX TWINPOWER of the time, boasts excellent rod stiffness. This carbon rod, which is not very common, has seen some use, but it's a recommended piece. It features all Sic guides with guide alignment lines, but only the first guide at the base of the tip has a guide alignment mark. From the top to the base of the rod, it has a rugged feel. It's a carbon rod made with a multi-layer winding method, making it hard to break and providing stiffness. A treasured masterpiece for vintage enthusiasts. ※ Image 9 shows the guide balance of the rod tip.