Howdy I was wondering while standing in my Universal Circle. What type of fabric it is?
Does anyone of you guys know it?
I checked the page of balg.co but it did not mention it.
Edit: Its probably made of: Cotton Duck Canvas
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@DarkestKnight says canvas, here: Material for circles - #2 by DarkestKnight
Perhaps he can also answer more. 
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Sorry MOD, I should have used the search function. Thanks for directing me to the post.