| Rod core | Sheet-stacked core | Rolling-sheet core | |
|---|---|---|---|
| Material | Nickel-based alloy | Cobalt-based alloy | Nickel-based alloy |
| Relative permeability | μr ≤ 400,000 | μr > 72,000 | μr ≤ 350,000 |
| Size (mm) | 6.35 (D) × 200 (L) | 5 (W) × 4 (H) × 200 (L) | 6 (D) × 200 (L) |
| Weight (g) | 55 | 20 | 15 |