I know EXACTLY what it is because Aramith themselves told me so. There is NO coating on any pool balls. The various aramith balls like SuperAramithPro, Tournament, etc. all use specific resins and curing processes. Duramith is their latest and greatest but it is not a coating. In any way. The surface you see on balls is achieved by a multi-step sanding/polishing process, not some coating. BTW, Dynasphere balls as well as Centennials(Aramith SAP) and Predator ARCOS(same) are all made the same way. Final step is the sanding/polishing then into the box.