i had a pair of lucky black on black full cores and they were amazing they never ovalized the urthane is kinda grippy and fast i never got flat spots in mine and they never chipped but the full cores were a little on the heavy side and after 2 months of learning double whips i got a crack in them but it hit the ground at 50 mph on doubles but i kept riding them and they are still fine
50mph double whips? Bullshit.