The Bright Tangerine Black Hole Mini Rubber Donut fits on Bright Tangerine's Misfit and Misfit Atom matte boxes, as well as compatible ARRI matte boxes, allowing you to use lenses with a front outer diameter of 58 to 114mm. The rubber donut is flexible, making it especially useful for lenses that change length as they change focus. The donut snugs to your lens, allowing the lens to rotate without letting light flare your filters.