The LMB-25 Matte Box is a clamp-on matte box that holds 4x5.65 filters and can be configured with 2 or 3 filter stages.
The MB-18 Studio Matte Box is a rod based matte box that holds 4x5.65 filters and can be configured with 3 or 4 filter stages.
The LMB-4 Matte Box is a 2 filter stage, clamp-on matte box, that holds 6x6 filters.
The MB-28 Studio Matte Box is a rod based matte box that holds 6x6 filters and has 3 filter stages.
The MB-840 Matte Box is a rod based matte box that holds 4x5.65 filters and has 2 filter stages.