The price of a harvester-blade is primarily driven by material composition and heat treatment processes. You should prioritize blades made from 65Mn spring steel or Boron steel (30MnB5), as these offer the best balance of toughness and wear resistance. Ensure the hardness rating is between 45-52 HRC; blades that are too soft will dull quickly, while those too hard will become brittle and snap. Additionally, verify the thickness (typically 2mm to 6mm) and the serration type (top-serrated vs. under-serrated), as these directly impact cutting efficiency and fuel consumption.