https://www.avient.com/news/pump-volume-portable-audio-speakers-new-versaflex-tpes-polyone
Protection against the Elements
For speaker gaskets and seals, Versaflex™ CE (40 Shore A) replaces separate O-rings with an overmolded, internal part that firmly bonds to polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), copolyester, or PC/ABS without adhesives.