Onyx Fly Reel - Spare Spools Size Chart
| Black Model | Silver Model | Descritpion | Backing Capacity |
| 10537-SP | 105375-SP | Spare Spool for Onyx Fly Reel #3/4 | WF4F + 50yds 22lb PES |
| N/A | 10538S-SP | Spare Spool for Onyx Fly Reel #5/7 | WF6F + 75yds 22lb PES |
| 10540-SP | N/A | Spare Spool for Onyx #9/11 | WF10F + 200yds 22lb PES |