A question about UTP cable

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I realise this question is actually quite simple, but please bear with me.

Is UTP cable supposed to be twisted the whole way through the outer coating, or just at the end?

The reason I ask is because I bought some cat 5e to practice making new cables, but I was surprised to find that there were no twists whatsoever.

I'd be grateful if anyone could shed some light

Thanks

 

Or you could have been sold low quality fake cable see the link below

http://www.aci.org.uk/images/ACI 055 Data cables news release.pdf