The price is primarily driven by the maximum rolling thickness and width capacity. Buyers must distinguish between pre-bending capacity and maximum rolling capacity, as pre-bending requires higher pressure and significantly impacts the machine's cost. Additionally, the yield strength of the material (e.g., Q235 vs. Q345 or Stainless Steel) dictates the required motor power and roll diameter. For high-precision tasks, look for machines with hardened rolls (HRC 45-50) and NC or CNC control systems to ensure repeatability and reduce labor costs.