There is a PTFE coating on hook surface.
Polytetrafluoroethylene (PTFE), abbreviated as PTFE, is a polymer synthesized by polymerization of tetrafluoroethylene as a monomer. It has excellent heat and cold resistance and can be used for a long time at -180~260 º C. This material has the characteristics of acid resistance, alkali resistance, and resistance to various organic solvents. Its friction coefficient is extremely low, so when the surface of the fish hook is coated with PTFE, it will be very smooth and not easy to rust.

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