Sweet sponge. Lively, good control, the ball really digs in to generate a lot of spin. It's surprisingly fast for a soft sponge. I'm using 2.2mm and there is not an issue in bottoming. When teamed with a CJ8000c topsheet (very thin and a little tacky) the combination really comes alive. The thin topsheet really reacts well to the soft sponge letting every ball dig into the sponge. That creates a consistent feel for all shots regardless of speed. No more problems with the ball having a different feel when slower shots only react with the topsheet.

The sponge may be a little soft for some players wanting faster rubber and a quick catapult.

This sponge has l-o-n-g dwell time that can generate massive spin with the right topsheet. I think it would be a good match on a faster blade rather than a slower one.