UST Para Fixed Knife, 4-Inch, Orange Titanium-coated hardened 440C steel is rust resistant and holds an edge with a tough 4mm thick blade with full tang will stand up to hard use Titanium-coated hardened 440C steel is rust resistant and holds an edge with a tough 4mm thick blade with full tang will stand up to hard use Titanium-coated hardened 440C steel is rust resistant and holds an edge with a tough 4mm thick blade with full tang will stand up to hard use Under 4" blade is designed for serious work. Provides serration for fast-rope cutting Lifetime Limited Warranty