This is [Belden 9223](http://www.belden.com/techdatas/english/9223.pdf). It is a 50-ohm coaxial cable, velocity factor 0.56

![coax](https://i.stack.imgur.com/ij6S5.png)

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This is [Belden 8524](http://www.belden.com/techdatas/metric/8524.pdf). It is a 22 AWG hookup wire. No velocity factor in the datasheet.

![hookup wire](https://i.stack.imgur.com/RURvo.png)

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Why does the coax datasheet have a velocity factor, while the hookup wire datasheet does not?