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on September 19, 2023 4:35pm Butterfly Feint Long 1.3mm Joris, For a pips rubber to be firctionless , the top ( and or sides) of the pips should be smooth or like glassy Think about a frictionless anti. The surface is slick. The same concept applies to frictionless pips. Conversely when the top &am...

I assume you are looking for rubbers not listed on ITTF LARC & de-approved by ITTF

You can also check Pip Parametrics database for list of ITTF banned but WdTTF approved rubbers