In IL we are required to place an identification in removable, I place the name, tooth mold Shade & dt mfg. In 2010 several DDS's started asking for identaloy for frame material or metals used in wrought wire & Acrylic used, this information has been in my "Winvoice" & their invoice's since 1997 when I started using "winvoice" Vitalium2000+ supplied a green sticker I pass on & I printed up stickers with the acrylic name, shade, CAS# & CE or FDA number. Note when I use Fricke they have a really nice sticker to pass on to the DDS, Astron is working on the same since I have been bugging Doug, & Dave Lang is doing the same. Myerson is supposed to be sending me the CAS & FDA for the flexible. If more of us ask the mfg for these handy identifiers they will start producing them. It's just my way of telling the DDS I don't use no off shore fecal matter.