Ok, ChicagoJack, here's my little contribution to your thread.
39g … 40 inches - should not be stretched … 23mm … 1mm ... Gosen Sorbothane Cushion Grip System II
The above measurements are for the Sorbothane gel portion only. You must install an overgrip of your choice (or the one that comes in the package) over the Sorbothane gel layer. Sorbothane by itself is rather fragile.
Positives: The Best shock-absorbing grip Period. Fairly thin.
Negatives: Discontinued. Very hefty. Can easily tear if stretched. Doesn't wrap around the butt cap well.