Changing sponge on rubber

hi i want to ask can i make any rubber without sponge? even if it ox rubber? just i want to know if i can  remove sponge from any original rubber?

ant that will effect on rubber?

Hi,

Rubbers are approved with or without sponge.  So you are not allowed to take sponge off or add sponge to rubbers.

If you do remove the sponge you will get a lot less spin and speed.