The ARRI LMB-4A is a 6.6"x6.6" lightweight matte box. The ARRI LMB-4A is designed for extreme wide angle lenses and can only be used by clipping on the lens directly.
The ARRI LMB-25 is a clamp-on matte box that expands the feature set and creative possibilities of the LMB-15, while retaining the low price tag of an entry-level LMB-5.
The ARRI MB-28 is a compact matte box designed to cover the largest cine zoom lenses. The MB-28 is available with a three-filter stage and a swing-away system.