No-fulcrum designation, shady flexible strip made from high-carbon steel.
Average the pressure to make the strip docile to windshield & make no noise, achieve perfect clean definition & improve scrape result.
Rubber board of flow oriented designation: ensure best scrape result of blade no matter the car is in high-speed or against the wind.
The strip is made from pure nature caoutchouc; it has stronger feature in antifriction, anti-ozone, endure high & low temperature.
Multi-functional spring with hock
You can assemble it freely to standard pothook without any tooling.

The fix-assembly in middle of the FB-645 is  made from zinc alloy