[DonRotolo]

We measured three balls as follows:
180g
181g
183g
The scale is only good +/- 1g though.
(That's about 6.3 oz. (180g) for the metrically challenged.
For diameter, we measured just a hair under 6.875 for all three, they are very consistent.

There is a thickening, a heavy 'lump' in the middle of the black side (well, it's black on our three plus another one I saw) that is heavy enough to cause the ball to always stop with that spot down.

The skin is very thin - how do you describe it? - much like the thin skin of most any molded foam ball you have even seen. It is not open-pored like the surface of a cut piece of foam rubber.

Hope this helps.

Don