https://pyra-handheld.com/boards/threads/even-more-to-see-here-now.83733/page-13#post-1455694 The pelleters are in Looks to be AZ1900 https://www.idemitsu.com/products/petrochemicals/engineering/grade/index.html https://www.materialdatacenter.com/ms/en/Tarflon/Idemitsu+Chemicals/TARFLON®+AZ1900/71236e94/5766 Bromo and phosphour are bad, so those are just out, but there are some glass fiber reinforced ones. Don't know how that works with wireless signals, or heat transfer/buildup. With a bit of research we might learn more about this aspect of the pyra, luckily the people doing it know what they are doing, and the AZ1900 look to be good. Having something recycled from the ocean plastic is all the rage, but I don't think (?) it can be combined with something that doesn't leak any carcinogens. Willing to pay for a special run if something interesting shows up.