An exceptionally strong gelspun polyethylene thread (the strongest available) that is very supple and ties flat. Use the 50 denier material for smaller flies (trout), the 100 as an all-around thread, and the 200 for big deer hair flies or when you need to apply maximum pressure. Approximate breaking strength is as follows:
| 50 Denier | - | 4lbs |
| 100 Denier | - | 8lbs |
| 200 Denier | - | 16lbs |

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