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| Diameters of undrawn gut and strengths of casts | | Royal Hebra | 0.019 – 0.022 inches | 5x | stout | or 0/5 | | Imperial | 0.018 - 0.020 | 4x | stout | or 1/5 | | First Marana | 0.017 - 0.018 | 3x | stout | or 2/5, 3/5, 4/5 | | Second Marana | 0.016 - 0.017 | 2x | stout | oe 5/5, 6/5 | | First Padron | 0.014 - 0.016 | x | stout | | | Second Padron | 0.013 - 0.015 | | stout | | | Regular | 0.012 - 0.014 | | medium | | | Fina | 0.011 - 0.013 | | fine | | | Refina | 0.009 - 0.012 | x | fine | | | Refinucha | 0.007 - 0.0011 | 2x | fine | | |
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