Buffing disc

A homemade tool out of an old grinding wheel

https://youtu.be/l9Sl4UqlHqA

Thanks Kovanca Polock! We've added your Buffing Disc to our Buffing and Polishing category,
as well as to your builder page: Kovanca Polock's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-buffing-disc"> <img src="/uploads/223557/homemade-buffing-disc.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-buffing-disc">Buffing Disc</a> <span> by <a href="http://www.homemadetools.net/builder/Kovanca+Polock">Kovanca Polock</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/buffer'>buffer</a> </div> </div> </div> </div>

What material is the buffing wheel made of?

looks like one of those sealing glands used in piping work - but I though those were spun silica (fibreglass), so nothing I'd want being turned into respirable dust - very happy to be wrong on the source of the felt.