have been thinking how much i dislike the horrid clear air tubing i have (which goes white & nasty looking after a couple of weeks) & wondered if there was such a thing as black tubing. one ebay search later & lo & behold there is my black airline!! thinking i'd found something special i return to kokos & typed in a search, only to discover it had been mentioned here before... in 2005. i am soooo cutting edge! oh well, black tubing is on its way