Astral projection question: How does metal effect travel?

I’ve read that when you’re trying to astral travel, you need to remove anything metal that touches your skin. Why is that? I know that removing constricting clothing and jewelry is good when you are trying to relax and focus. Is there something significant about metal? Something that could hurt my chances of travel? Thank you for your answers.
Thanks again for your answers. I understand that not everyone agrees in Astral Projection. I do. Please at least be respectful when answering.

Metals act as conduits which absorb energy from the aura.

The aura is really a quote: ‘compressed holographic field of torsion waves’ which your body produces.

Gold, and Emeralds, citrines, and rubies, quartz crystals, amethyst and the like are beneficial.

Metals such as Tin, Chrome, Brass, Iron are very damaging to our aura.

Astral Travelling – Pharoah Sanders