The 114mm Flexible Cuff Adapter Ring from Vocas snaps into Vocas MB-215 and MB-255 rod-mounted matte boxes, which feature a rear opening of 114mm. It serves as an anti-reflection donut for lenses from 50 to 110mm outer diameter. It utilizes a flexible fabric that allows for lens travel, so it is suitable for use with lenses that exhibit lens travel when focusing or zooming. The flexible fabric features a draw string and cord lock.