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They don't give a damn on illegal or not, almost all pros are boosting. It's said that chinese players have some factory boosted rubbers, but I'm pretty sure they add extra-boosting, you'll always see the pimples structure on their rubbers, as they are very old or pimples out. And european players also boost their rubbers, most of them from junior level, but they do that on already soft rubbers.No problem.
So you claim that pros like FZD, Ma Long, Lian Jingkun, etc dont boost their rubbers because it is illegal.
The fact that boosting is illegal is correct. Any change to the rubber after it comes from the factory is forbidden.
The legal limbo we have here is, that boosting with haifu or tlb is undetectable and ittf hasnt yet found any way to do otherwise.
But still that doesnt proof that pros are boosting!
What does proof it is the look of their rackets. If you check ingame footage or videos (preferable in HD, otherwise you cant quite see that in closeup) you gonna see the signature way a boosted rubber looks. If the lighting is reflected from their forehand rubbers you see domed/slightly curled edges and you gonna see the pimple structure of the rubber. If you have a new unboosted h3 you wont be able to see the pimple structure like that. Unboosted they are quite closer and nearly unable to see.
Finally, i am sry for being "rude". But using your superficial knowledge to help someone isnt quite helpful or nice either.
I used booster once on my 1st Neo Hurricane 3 and it suddenly became more bouncy, had more gears, while maintaining the low throw angle. But in a couple of weeks it became a bit "dead" again, maybe a bit softer, but still nice. The current one is unboosted and I like it more like that.
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