Blue TB110 72A’s are known to delaminate quite easly for many years and and as far as I know still haven’t been fixed. However there is no known instance where black 72a’s have delaminated. Back when TB110 72’s where released both blue and black versions where for sale however black ones where taken out of production after one year so only limited amount of these wheels exist. These black wheels are AFAIK only way to have TB110 72a kegel core experience without delamination. They also look a lot nicer and are often used as marketing material for other products. 
Other sidenote, it seems like black 78a’s are a lot more common occurance but are also unobtainum as of now.
EDIT: Heh, so the 74a blacks are now available, however 72A arctic ones are not? Does this mean we should invest in blue wheel stocks? 
