Universal Donut

"Zacuto's Universal Donut attaches to the 105mm matte box or Petroff matte box donut (not included), when using the Petroff matte box. It attaches with velcro and stretches to fit to any lens from approximately 40 - 85mm with an expanding elastic opening.
Universal Donut Attaches to 105mm matte box or matte box donut (not included)"