The Swarovski Optik 44004 is one tethered push-on objective cap for the 8x30 SLC Mark III binocular. Replacing your lenscaps when you're not using the binoculars keeps dust and debris off the lenses and significantly increases the quality of your views. Many fine quality binoculars come with push-on style front lenscaps which are easily lost-and a nuisance to maintain custody over in the field. This tethered-style objective lenscap, however, functions perfectly. It stays just out of the way but easily located when you're done glassing.