This Black and Silver Diffuser from Godox is for 51" Parabolic Umbrellas. One side of the diffuser features a black material to absorb light and reduce reflections when shooting through umbrellas. This creates more contrast and provides a dramatic look for portraits. The other side of the reflector has a silver material for increasing light output and providing a more specular look. This creates a shinier light that is well-suited for fashion photography, which highlights hair and makeup.