The Jack™ core was designed as a low RG symmetric core with a high differential. The low RG engages in the mid-lane assisting in ball motion, and the high differential increases track flare potential giving the ball more opportunity to grip the backend while using standard layouts.
Core Type
Symmetric
16 pounds
RG
2.504
Diff
0.054
15 pounds
RG
2.520
Diff
0.054
14 pounds
RG
2.542
Diff
0.054
13 pounds
RG
2.585
Diff
0.040
12 pounds
RG
2.608
Diff
0.040