Not sure now, can't quite remember. I know they came from a company called Ferrari's in London, they are a very big company selling lots of engine components. So i wouldn't have thought they were that crap. Just noticed on one of the other pistons as well that the top rings is loose, and you can see what they call 'blowback'?! Will hopefully have some pics later.

Davidnormanuk - Someone on this site is selling some new Mahle pistons, I might get those - any idea why yours cracked? What boost are you running?