This replacement bridge head slides onto your old bridge stick, and can be permanently fastened with a small wood screw. This is a low-priced bridge (mechanical bridge, rest) for a bridge cue. Place it over a brdige stick, or screw it in with a small screw to permanently attach it. It is made of a strong plastic.This replacement bridge head slides onto your old bridge stick, and can be permanently fastened with a small wood screw.