The reason why steel wire ropes are both strong and flexible lies in the fact that they are structured with a strong material as the framework, and multiple layers of twisting form a stress-relieving structure, transforming the hard and brittle steel wires into flexible and tensile-resistant rope bodies. 

Its "rigidity" stems from the high-carbon steel material. After cold drawing and heat treatment, each individual steel wire has extremely high strength, is wear-resistant and pressure-resistant, and can withstand tremendous tension. This is the fundamental reason for its rigidity and load-bearing capacity. Each individual steel wire is inherently hard and prone to breaking, and cannot be bent. It is precisely through the structural design that flexibility is achieved. 

Its "softness" stems from the multi-layer helical structure of the silk strands and the rope strands. Multiple thin steel wires are twisted into a strand, and multiple strands are then twisted into a rope. When bent, each steel wire can undergo a slight relative sliding, which disperses the bending stress and prevents it from cracking like a solid steel rod when bent. At the same time, the reverse twisting design is adopted to reduce torsional rebound. Combined with the internal rope core, it provides cushioning and clearance, allowing the entire structure to be flexibly bent and wound around pulleys while still maintaining overall strength. 

In simple terms, it involves using the hardest material to make the wires, and then using ingenious weaving structures to combine the rigid steel wires into a whole that is both strong in bearing capacity and flexible in deformation. This is the key to its "rigor with flexibility".