The highly successful Rotary core has been sought after so much that Roto Grip re-introduced it with the Nomad series.
Core Type
Symmetric
16 pounds
RG
2.520
Diff
0.049
15 pounds
RG
2.550
Diff
0.054
14 pounds
RG
2.570
Diff
0.046
13 pounds
RG
2.660
Diff
0.037
12 pounds
RG
2.660
Diff
0.037