Yes they do wrap very nicely and unlike the Wilson grips, the colour does not bleed out.
I would say they are maybe 1.6mm thick, the same as the Wilson, which is perfect me (I didnt want to go thinner on my grip size).
All in all I am really pleased with the Gamma leather. Easy to fit, great feel, perfect thickness to replicate stock grip and looks great too. I use an overgrip though...to just show the bare leather grip would be tennis pornography...just looks too good on my Bio 300.
"Tennis is just chess with balls....zugzwang"
Dunlop, Prince....who knows...who cares.