These Westcott FlexiGels for FJ400 Strobe add a pop of color or subtle effects to your photos when used with the Westcott FJ400 400Ws Strobe. You’ll receive a pack of eight different gels (red, orange, light orange, yellow, green, blue, purple, and pink) that slide over the strobe’s glass dome. Durable and heat-resistant, the filters remain secured without tape or clips and work well with a variety of light modifiers. They’re also compatible with third-party strobes that have a 2" height x 3.4" diameter glass dome and adequate ventilation-hole alignment.