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.
X2 Dunlop Biomimetic 300 / X2 Prince Exo3 93