lightbulb core. i had 4 or 5 of them. shot 3 299's and 805 wih them. Ball was very driller friendly. the ball had about the same amount of hook as the dull blue hammer but a little longer and then stronger off the spot
--------------------
Arsenal: Mega Friction, S-75, Break Point x 2, Break x2,Break,Sideways,Clutch,Maniac,Awakening,Link,Hype urethane,Global Globe, 14# golden globe
Bowlingboards.com