52 (132cm) Round ZipDisc Cover Reversible This kit contains one 52" (132cm) Round Translucent ZipDisc and one 52" (132cm) Round ZipDisc Reversible Cover. four-color reflector covers can be used on any round or oval reflector discs. Each cover has a gold, white, silver and black side. Simply slide one over your round reflector and zip it up!