This was a very simple filter media i found at 99store. They came in three blocks, hard hard soft.... they feel just like JapMats but a little harder... As you can see I'm running in on my Xp3. Its on my 60 which seems to be working just fine. I washed them off and cut them down to size. Might get another 6 n replace all or 3. Don't know if i want to replace the black ones just set this filter is still new
