http://www.tabletennis11.com/other_eng/der-materialspezialist-transformer
I like h3 blue spong or h3 pro. But they are not currently. So i choose this sponge (i wish i was the winner) thanking TT11
Sardius blade is very fast. it does not vibrate.people like the speed of use. currently sold in Viet Nam. some Sardius old tag perfect condition is quite expensive