Opteka FS-80 Universal Flash Modification System with Gold, Silver and White Inserts Fits most external flashes with the included velcro adhesive tabs or the optional Opteka CL-1 clinch band The FS-80 allows for 80% ceiling bounce with 20% fill. White insert provides a neutral bounce surface when no ceiling is available. Gold insert warms the light for late afternoon fill. Silver insert adds a more specular look to the highlights while maintaining shadow softness.