## Resistance Strong |
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The resistance of a band depends on the cross section (width * thickness), and the stiffness of the rubber compound used.

The first step is to get bands with sensible increments of width.

- Yellow 0.25"
- Red 0.5"
- Black 0.75" (many suppliers get this one wrong)
- Purple 1.25"
- Green 1.75"
- Blue 2.5"
- Orange 3.25"
- Grey 4"

The second step is to get bands that have consistent resistance proportional to the cross section. Many suppliers do a bad job at this.

My supplier has good control over the width, and a consistent rubber compound. Unfortunately there is about +/- 10% variation on band thickness. Measuring the thickness is not easy, as the pressure of a caliper will easily distort the band. I found that it is easier and more precise to weigh the bands. Measured band resistance correlates well with band weight.

OCD solution: To get well-matched sets, I sort the bands of each color by weight, then make a set from the heaviest bands first, descending to the lightest. This way the bands in each set will be from the same part of the gauss distribution.

This is why I don't sell individual bands, except for the grey one. Please keep sets together.

Measurements for the set of bands that I use:

Description | 1.2x | 1.4x | 1.6x | 1.8x |

0.25" yellow | 1.6 kg | 2.6 kg | 3.3 kg | 3.8 kg |

0.5" red | 3.5 kg | 5.5 kg | 6.8 kg | 7.6 kg |

0.75" black | 5.5 kg | 8.8 kg | 11.1 kg | 12.1 kg |

1.25" purple | 8.8 kg | 13.8 kg | 16.8 kg | 19.6 kg |

1.75" green | 11.4 kg | 19.0 kg | 23.7 kg | 27.1 kg |

2.5" blue | 16.4 kg | 25.5 kg | 32.5 kg | 35.8 kg |

3.25" orange | 20.3 kg | 32.9 kg | 39.9 kg | 45.9 kg |

4" grey | 24.6 kg | 39.3 kg | 48.7 kg | 55.8 kg |

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