What determines the straightness of fishing rod?

Equivalent: the straightness of the fishing rod when it is pulled into a straight line. The stronger the fishing rod, the better the material and the stronger the impact resistance. A typical example is the black pit competitive stick, which pursues the quantity and quality of fish and can easily compete with big fish. The more knots, the lower the strength. The lower the natural firmness. The fishing rod with the same size and grade of carbon fiber cloth has higher strength and better firmness than the short knot rod.

Hardness: H and tonality are commonly used to identify the hardness of fishing rod. The main factor that determines the hardness of fishing rod is carbon fiber cloth. The higher the grade of carbon fiber cloth, the more carbon fiber cloth is used and the higher the hardness of fishing rod. Common ones are: 4H, 6H, 8H, 10H. The larger the number, the higher the hardness.