Neewer 4 Pieces Color Filter Set (Red,Green,Orange,Blue) for Neewer AC Slave Flash Strobe Bulb S45T 45W 110V Create special effects and make each photo unique. These filters work great on backgrounds, adding color to still lifes or just an over all color change. Made of hard plastic and tighten on over the AC slave flash strobe bulb Compatible with Neewer AC slave flash strobe bulb S45T 45W 11V They are very convenient and easy to install