Brand New SuperStroke PXG Flatso 3.0 and 1.0 Putter Grip. 
Not the Countercore Model (no weights). 

Details:

Flatso 1.0:
1.10 " 28mm 10.50 "  26mm  85g 0.58 "

Flatso 3.0: 
1.40 " 35mm 10.50 " 26mm  60G 0.58 "

(Weight tolerance +/- 2g)