This is one tethered push-on objective cap originally supplied by Swarovski(in a pair, of course) with the 8x32 and 10x32 WB EL series binoculars. 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.