Vinyl covers in a variety of diameters to protect lens ports.
1.75-inch fits the EV Manual Controller.
2-inch fits 46mm threaded lens ports.
3-inch fits most 67mm threaded lens ports found on compact digital and video housings, as well as the Mirrorless Flat Macro Port Standard.
3.9-inch fits compact digital ports which accept the WD-4 Dome, as well as the Modular Flat Front for DSLR housings.