It's random from the factory, specific hardness only on selected quantity and I believe only in Asia market, all other market are 37-39/40-42 like this, buy province version. Chooses the hardess you want.
The code on package, and about the code on sponge, I searched some Chinese website said that no meaning, like the letters and the numbers just different dates and the machine row something like that.
37 degree orange h 3 province is very good for back hand after boosted, if you don't mind the heavier weight.I believe you can handle the 40 degree blue sponge , cause I like you from penholder to shake hand.
So you think the other one from China is better quality? I will have some rubbers from China this August, will see what's the difference , BTW I also buy from TT 11,