When sourcing Rambo-style survival knives, prioritize high-carbon stainless steel (such as 440C or 7Cr17MoV) for the blade to ensure a balance between edge retention and corrosion resistance. The blade should ideally feature a full-tang construction for maximum structural integrity during heavy-duty tasks. For the handle, look for ergonomic designs using slip-resistant materials like knurled aluminum, G10, or high-density rubber. If the knife includes a hollow handle for survival kits, ensure the cap is fitted with a precision O-ring to maintain a waterproof seal.