SmallRig 3648 Filter Frame 4 x 4" - Filter Frame (4 x 4") 3648, accessory for Star-Trail and Revo-Arcane series matte box, is designed to balance exposure under complex light environment by allowing installing multiple slide-in filters. The quick-release filter fray features aluminum alloy frame and anti-fingerprint design. It has anti-off safety lock to secure filter and works with matte box or filter system to give the greatest quick release convenience to users of Star-Trail and Revo-Arcane series matte box. Note: 1: Compatible with Star-Trail (95mm) and Revo-Arcane (114mm) series matte box 2: Please put Filter Frame (4 x 4") 3648 in the innermost slot near the lens 3: Incompatible with 100 x100mm slide-in filter   Compatibility:                                    1: Any brand of 4 x 4", 4mm thick slide-in filter; 2: Compatible with Star-Trail (95mm) and Revo-Arcane (114mm) series matte box;   In the Box:     1 x Filter Frame (4 x 4")