The OPTIPOP R 6232 is a dry-cloth cassette refill for US Conec's four OPTIPOP cassette-style refillable fiber optic cleaners. Each OPTIPOP R Cassette features densley woven, antistatic micro-fiber cleaning fabric which removes harmful contaminates off of the ferrule end face. Easy to install Replacement Reel reduces fiber optic connector cleaning costs and offers as many as 400+ cleanings per reel.