The Ikan FHS400 Filter Holder for S400D Light Fluorescent Fixture models is a filter frame designed for S400D fluorescent light fixtures--the frame allows you to attach a gel to it and slide the frame into the filter channel on the light.
Specifications:
Dimensions: 22.875 x 14.625 x 0.0625" (58.10 x 37.14 x 0.158 cm)
Weight: 0.60 lb (0.27 kg)