This LMB-25 Two and Three-Stage Matte Box Set from ARRI is a basic kit including the LMB-25 lightweight matte box, one two-filter stage, one three-filter stage, three 4 x 5.65" / 4 x 4" combo filter trays, and one top/bottom flag.
The LMB-25 shade includes captive screws for easy removal and attachment to its frame. The included carbon fiber flag offers extended flare protection and may be positioned at the top or bottom of the matte box depending on your shot.
https://www.bhphotovideo.com/c/product/1288792-REG/arri_kk_0005788_two_three_stage.html
