says
Table tennis clown
Well-Known Member
I don't think Ittf bothers much about checking top rubbers for consistency. As a matter of fact I don't know why they bother at all.a change to the topsheet would be against the rules.
Take some older DHS and Loki rubbers and compare them with the ones that are sold now. Just about the only thing that remains the same is the actual Ittf number.