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The Rubber Donut Set from Vocas includes rings in five different sizes. These rings provide the Flexible Adapter Ring (0420-0001 sold separately) with a range of inside diameters, including 80mm, 90mm, 100mm, 110mm, and 120mm. When used together, the donut set and the flexible adapter ring enable the use of a MB-4 series matte box with lenses of different sizes.