Short Pimples different sponge thickness

Hi Alois,

i am trying to play as much as possible with players using pimples (short or long), because i find very very difficult to play with them.

A player of my (new) t-t team is actually using identical short pimple rubbers on both sides, but with different sponge thickness. The red one is glued on a thick sponge whereas the black one on a thinner. What is the difference in behavior between the two sides ?

Thanks a lot, best regards !

Marco