japanese penhold table tennis?

Question

do japanese penhold blades in table tennis have rubber on the backside?

Answer 1

Japanese penhold blades don't generally have rubber on the backside.
Chinese penhold blades have rubber on the backside.

Answer 2

By the rule players's blade must have rubber attach on both side on the blade. But if you use only one side(Such as Japanese penhold blade) the other side you have to left the blade blank with black color.

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