| Spring Color | Number | RPM (heavy shoe) | RPM (light shoe) |
| Brown | NA013 | 1620 | 1800 |
| Black | NA017 | 1900 | 2100 |
| Red | NA020 | 2040 | 2500 |
| White | NA030 | 2470 | 2900 |
| Blue | NA040 | 2650 | 3200 |
| Purple | NA050 | 2900 | 3600 |
| Green | NA060 | 3200 | 4000 |
| Big Orange | NA079 | 3500 | 4400 |
| Big Brown | NA086 | 3850 | 4900 |
| Big Red | NA088 | 4200 | 5500 |
