US Dupont Tynex Filament: http://www.dupont.com/products-and-services/plastics-polymers-resins/filaments.html
That's a fancy name to say that we work with the leader of synthetic filament manufacturer. All the bristles around your toothbrush, paint brush or toilet brush or synthetic filament which are most of the time nylon, which is a sort of plastic.
ABS or POM plastic.
Oh yeah, we just came up with a HEMP plastic version. To be released soon...