Tams used to be .006 and as far as I know has gone to .007. I think .007 is ok, but if I was going to make another, I'd go with .008 or 9. I am really liking the Eurofighter Straight pipe from Composite Arf, I have wetstarted it, flamed it beyond recognition, run a jet through a barbwire fence, and still three years later, that pipe is holding up really really well in three different airplanes. I don't know how thick it is, but it is bulletproof.