Sympla Flexible Mattebox Kit is a "ready to go" solution that includes all the necessary pieces inside one box. The Flexible Mattebox System is one of Sympla kits. The multi-purpose Flexible mattebox holds 4x4" filters and protects the lens from stray light, while also permitting fast lens changes. The included Variable Plate component, with its vertical and lateral micro-adjusters, allows easy and precise alignment of the lens with the Flexible Mattebox. It is compatible with all Manfrottto Video heads.