Of course it was banned as soon as ITTF found out about this around 2016 or so only 2 years into plastic ball era.
I used to play against an advanced skilled experienced player & it was a nightmar eto play against.
Highly recommeded only if you cannot find Dr.Neubauer Scalpel & Inferno (both banned i by 2008 Frictionless Pips Ban) which gave me more trouble

Of course much better than current Stiga LARC long pips
Don't know where to buy though