Red & Black rubbers

Hi

Could you please explain me which is (are) the diference(s) between the red and black rubbers?

And other question:

Is it valid that some player has both rubbers in the same color?

Thanks

Hi Arturo,

There is no performance difference in the colour of the rubber.  

You are not allowed to have the same colour on both sides however.

You need to have one side red and the other black.  This rule was brought in because you can have different types of rubber on the two sides and it makes it easier for your opponent to tell which side and type of rubber you have hit it with.