Weight of 729 2.1mm OEM from Zero Pong

The blue sponge version is more like the original 729, harder and tackier than the white and orange sponged versions. I like the blue sponge version better but always get the white! Dissapointing.

The white sponge is soft and crumbly, it feels a bit weird as its a hybrid of a Euro rubber and a Chinese rubber

I have used 729 to cover old blades that people use at the company TT table.  The ones I have are about 63 gm and the black sheet has a blue sponge and the red sheet has a lighter red, almost pink, sponge.
The 729 OEM I have bought isn't that bad.  One can loop pretty well with it.  The problem is that the top sheet looks like crap after a few months but they still grip.  It is more than good enough for the company players.

I still have one red and black 729 OEM 2.1 left.
I have never seen a white sponge version.
Also, the black 729 OEM 2.1 with the blue sponge looks a lot like SST Pro Team.  Both the top sheets and sponge look almost identical. The SST Pro Team sponge seems a little firmer and the SST Pro Team Top sheet looks shinier and more consistent.  I have wondered if SST Pro Team rejects get sold as black 729 OEM 2.1.  The weights of the two are about the same.