When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I believe it should be stamped under the cover somewhere.
Ok so Polypropylene. I did see a PP-TD40 next to the manufacturing date stamps. When I searched for PP-TD40 I didn't find anything that led me to a material type.
Thanks.