This kit includes 3 different sizes of Rubber Don uts to help block light on lenses that don't fit standard rear mounts. These rubber seals mount to the back of the matte box body and adapt to different lens sizes without letting in unwanted light. This is very useful because blocking unwanted light behind the filters can reduce ghosting and other reflection artifacts.This kit supports lenses with a front diameter of 80-95mm, 95-114mm and 114-136mm.Key Features:Designed to fit the Mirage Pro matte boxBlocks light and prevents unwanted glareFlexible sizes for non-standard lens sizesCompatible with front diameters from 80 mm to 134 mmLightweight design, suitable for a variety of camera setupsPlease note: To use this accessory, the matte box must be mounted on rods and a Clamp On 136mm rear mount is required.Package Contents:80-95 Rubber Donut95-114 Rubber Donut114-136 Rubber Donut