... material POM ( Delrin),PP, HDPE,PS,.. Plastic Balls: Material: Zytel®, Polymide,NYLON,PA6, PA66..... Size: 2.38mm~50.4mm(3/32"~2 ... for your application and budget. below for physical properties:Nylon Balls (Zytel®, Polymide,PA)is used in check valves, light load ... It is not resistant to aromatic hydrocarbons and chlorates. Nylon Balls (Zytel®, Polymide,PA)is used in check valves, light load bearings ...