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| Parameter | Ferrara rings |
| Variable apical diameter | 5.0mm-6.0mm |
| Cross- section | Triangular |
| Segments/each | 90, 120, 140, 160 or 210 degrees |
| Hole | 0.20mm in each end |
| Segments thickness | 0.15mm-0.35mm |
| Base | 0.60mm |
