Ring forearm straps

Hi. What are the straps around the forearms in the LARS videos. Where can I buy them. What are they called.

im in the uk. And I have no idea where to get them. 

Any help would be much appreciated. 

Hi Richard,

Instructions for making the straps are here

https://my.gymnasticbodies.com/r-lars-straps/

I used the straps from a spare pair of rings I had around.

Thanks Jon.

Legend. Thanks dude.