Hook flange is an entirely new method of securing a spoke-to hub shell. This design is proprietary to usage with Berd spokes and removes some of the prebuild procedures for using these spokes.
The flanges are recommended for a 2x or 3x lacing only. Dependent on hub spacing/configuration spoke count configuration is limited
This may be your first time hearing about Berd! These unique spokes are made of UHMWPE (Ultra High Molecular Weight Polyethylene).
UHMWPE has 12 times the strength to weight ratio of steel and even floats on water! The spokes have an improved fatigue life over steel and are impervious to the elements.
The spokes have a similar structure to a standard steel or titanium spoke but feature a loop on the hub end rather than the typical head or J bend.
Each spoke uses a 2.0 (14g) thread and has a small wrench flat to prevent twisting/winding while truing