These special eyepieces are computer designed to keep visual aberrations to an absolute minimum. The inside surfaces and edges of all lenses are blackened, to keep out reflected light.
Outside surfaces are flat black, with rubber grips for secure handling.
Rubber eyecups are included both for comfortable use and to keep out extraneous light. Threaded barrels accept Celestron thread-in filters. Lens and barrel caps are included for safe storage. It is the finest zoom eyepiece for low to medium power observing. It's an excellent zoom eye-piece that performs superbly, with fully multicoated surfaces.