WORLD'S NO 1 TRACK AND RINK SPEED SKATING WHEELS SINCE 1985. COMES IN TWO HARDNESS SOFT(BLUE) AND HARD (ORANGE) . THE BLUE CANNIBAL IS THE BEST WHEEL FOR SLIPPERY SURFACE AND ORANGE CANNIBAL IS USED FOR ANY SURFACES. THE CANNIBAL INSERT IS CNC MACHINED FROM A SOLID AIRCRAFT ALLUMINUM BLOCK. MAKING THEM THE WORLD'S FASTEST SKATING WHEELS.