Amorphous thermoplastic material balls, they provide excellent mechanical and stiffness/thoughness features (the best ones among plastics), very good thermal stability and creep resistance, they are suitable for high temperature applications. Torlon® 4301 has better friction and wear resistance properties. They are electric insulators.
Please note: chromatic appearence of the balls may be subject to variation.

Applications

Special bearings (when it is demanded lubrication absence, high temperature and wear resistance), automotive components (transmission). They are used in aviation/aerospace and electrionic industry.
Applications even in naval industry and angling.