This is a 4x4" Bright Tangerine Filter Tray for the Bright Tangerine Strummer DNA matte box. The Strummer DNA matte box, not included, can accept 6x6" and 4x5.65" filter trays with optional filter cassettes. This filter tray allows you to use a 4x4" filter, and it features solid baffles to block the light from sneaking around the filter.