When sourcing movie knives, the material determines both the price point and the legal classification. For high-end collectibles, 440C stainless steel or Damascus steel is preferred for its aesthetic and durability. For cosplay or prop use, zinc alloy, high-density foam (PU), or 420 stainless steel (unsharpened) are common. Ensure the HRC (Rockwell Hardness) is specified if the buyer intends for the knife to be functional, though most movie replicas focus on surface finishing like PVD coating or acid etching to mimic screen-accurate looks.