The inner core nylon material was developed to be strong enough to tightly
secure the screw, yet soft enough to allow screws to be inserted repeatedly
without losing the snug fit.
The outer shell polymer and fin design helps to minimize the weight
of the piece, while providing a secure fit for most STX handles.
This multi-material combination is fused together, resulting in a long-lasting,
permanent feature developed to put an end to head rattle.